{"title":"Books","description":"","products":[{"product_id":"secrets-of-stargazing","title":"Secrets Of Stargazing","description":"\u003ch3\u003eBy Becky Ramotowski\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e Format:\u003c\/strong\u003e Paperback\u003c\/p\u003e\n\u003cp\u003eHere's the perfect how-to book for recreational stargazers. It's loaded with practical advice to help new observers spend more time exploring the night sky and less time fumbling with equipment or wondering how, when, and what to observe.\u003c\/p\u003e\n\u003cp\u003eIn \u003cem\u003eSecrets of Stargazing\u003c\/em\u003e you'll discover how to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eQuickly get started stargazing if you're the lucky recipient of a new telescope\u003c\/li\u003e\n\u003cli\u003ePlan your observing sessions and record your observations\u003c\/li\u003e\n\u003cli\u003eStar gaze in the city despite the lights\u003c\/li\u003e\n\u003cli\u003eQuickly and easily collimate and polar align your telescope\u003c\/li\u003e\n\u003cli\u003eUse star charts and discover star-hopping\u003c\/li\u003e\n\u003cli\u003eSee faint objects without actually looking at them\u003c\/li\u003e\n\u003cli\u003eObserve in comfort\u003c\/li\u003e\n\u003cli\u003eDecipher weather reports and understand sky transparency and seeing conditions\u003c\/li\u003e\n\u003cli\u003eFind others in your area who share your love of the night sky\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhether or not you own a telescope, \u003cem\u003eSecrets of Stargazing\u003c\/em\u003e is loaded with tips and tricks that are guaranteed to make you a better observer. It's a volume that no novice stargazer should be without.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat \u003cem\u003eSky \u0026amp; Telescope\u003c\/em\u003e's Peter Tyson has to say:\u003c\/strong\u003e \u003cbr\u003e\u003cem\u003e\"If you're just getting into amateur astronomy, this is a handy guide to get you started. Find out how to use a star chart, how to plan an observing session, and much more.\" \u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eISBN 13:\u003c\/strong\u003e 9781931559409 \u003cbr\u003e\u003cstrong\u003eNumber Of Pages:\u003c\/strong\u003e 96\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40525185253528,"sku":"59409","price":13.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/Secrets-of-Stargazing.jpg?v=1628526815"},{"product_id":"a-dictionary-of-modern-star-names","title":"A Dictionary of Modern Star Names","description":"\u003cmeta charset=\"utf-8\"\u003e\n\u003ch3\u003eBy Paul Kunitzsch \u0026amp; Tim Smart\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eFormat:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003ePaperback\u003c\/p\u003e\n\u003cp\u003eSirius, Algol, Castor and Pollux, Mizar and Alcor: these names are well known to stargazers. But others — Rasalhague, Vindemiatrix, Zubenelgenubi — are obscure tongue twisters. Have you ever wondered where all these exotic-sounding star names came from? In this revised edition of the venerable\u003cspan\u003e \u003c\/span\u003e\u003ci\u003eShort Guide to Modern Star Names and their Derivations\u003c\/i\u003e, Paul Kunitzsch and Tim Smart track down the origin and meaning of 254 star names. 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Levy\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eFormat:\u003c\/strong\u003e Paperback\u003c\/p\u003e\n\u003cp\u003eClyde Tombaugh: Discoverer of the planet Pluto David H. Levy\u003cbr\u003eIn 1930 Clyde Tombaugh made the discovery of one of the giants in 20th Century astronomy!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat \u003cem\u003eSky \u0026amp; Telescope\u003c\/em\u003e's Peter Tyson, has to say:\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003e\"Clyde Tombaugh is the farmboy-turned-astronomer who discovered Pluto – a rags-to-riches story of the astronomical kind.\"\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFormat:\u003c\/strong\u003e Paperback\u003cbr\u003e\u003cstrong\u003eISBN 13:\u003c\/strong\u003e 9781931559331\u003cbr\u003e\u003cstrong\u003eNumber Of Pages:\u003c\/strong\u003e 232\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40525275791512,"sku":"59333","price":13.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/59333_new.jpg?v=1627327194"},{"product_id":"pocket-sky-atlas-second-edition","title":"Pocket Sky Atlas, Second Edition","description":"\u003cp\u003e\u003cstrong\u003eFormat: \u003c\/strong\u003ePaperback\u003c\/p\u003e\n\u003cp\u003ePerfect for beginners and experienced stargazers alike, \u003cem\u003eSky \u0026amp; Telescope’s Pocket Sky Atlas\u003c\/em\u003e is your go-to celestial reference!\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSky \u0026amp; Telescope’s\u003c\/em\u003e celestial atlases are the standard by which all other star atlases have been judged for more than half a century. Our \u003cem\u003ePocket Sky Atlas\u003c\/em\u003e is no exception. This wonderfully detailed atlas is particularly handy to take on trips and use at the telescope, thanks to its compact size, convenient wire-bound design, and easy-to-read labels. To help you find your way, the charts show both constellation boundaries and stick figures.\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003eBy popular request, two special new lists are included in this second edition. One is a table of the atlas's 53 stars of unusual reddish hue (also known as carbon stars), and the charts where they are found. The other is a list of 24 nearby stars, with their distances in light-years and the charts showing their locations. All can easily be spotted in small telescopes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTHIS ATLAS FEATURES:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e80 charts with 10 close-up charts\u003c\/li\u003e\n\u003cli\u003eMore than 30,000 stars individually sized according to their relative brightness\u003c\/li\u003e\n\u003cli\u003e1,500 deep-sky objects color-coded by type, including 675 galaxies oriented as they are in the sky\u003c\/li\u003e\n\u003cli\u003eLabels legible even in dim light\u003c\/li\u003e\n\u003cli\u003eFits in a daypack or glove compartment, so you need never leave home without it\u003c\/li\u003e\n\u003cli\u003eIncludes nearest stars and carbon stars\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe regular and Jumbo versions of the \u003cem\u003ePocket Sky Atlas\u003c\/em\u003e are identical in content. They have the same 80 main charts and the same 10 close-up charts, differing in page size alone. The choice is yours!\u003c\/p\u003e\n\u003cp\u003eDue to higher printing costs, we have had to increase the price of the Pocket Sky Atlas.  We appreciate your understanding.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40525297909912,"sku":"59318-1","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/files\/PSA2e_C1.jpg?v=1762529986"},{"product_id":"sky-atlas-2000-0-desk-unlaminated","title":"Sky Atlas 2000.0 Desk Unlaminated","description":"\u003ch3\u003eBy Wil Tirion \u0026amp; Roger W. Sinnott\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eFormat:\u003c\/strong\u003e Map\u003c\/p\u003e\n\u003cp\u003eThe standard against which all other star atlases are measured. Each edition of Sky Atlas 2000.0 contains 26 large charts covering the whole sky, showing 81,312 single, multiple, and variable stars down to magnitude 8.5 and 2,700 of the best deep-sky objects scattered among them. Includes closeup charts of special areas such as the celestial poles and the Virgo-Coma galaxy region. This is the next step up from our Pocket Sky Atlas – and a must for every serious telescope user!\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDesk Edition\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStars and deep-sky objects are black on a white background\u003c\/li\u003e\n\u003cli class=\"last\"\u003eUnbound and printed on heavy paper\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40531190808728,"sku":"46883","price":39.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/46883_new.jpg?v=1627404403"},{"product_id":"advanced-telescope-making-techniques-vol-1-optics","title":"Advanced Telescope Making Techniques, Vol. 1 Optics","description":"\u003cp\u003e\u003cstrong\u003eEdited by Allan Mackintosh with G. Kenneth Hawkings and Ferdinand I. 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Calculator Programs for Telescope Maker\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40731716255896,"sku":"WBAVTM1","price":25.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/cover_atm1.jpg?v=1629379403"},{"product_id":"advanced-telescope-making-techniques-vol-2-mechanical","title":"Advanced Telescope Making Techniques, Vol. 2, Mechanical","description":"\u003cp\u003e\u003cstrong\u003eEdited by Allan Mackintosh with G. Kenneth Hawkings and Ferdinand I. Baar \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 9.00\" by 6.00\", 320 pages, hardbound.\u003c\/p\u003e\nThe subjects covered in Advanced Telescope Making Techniques, Volume 2, Mechanics by chapter are as follows: \u003cbr\u003e1. Grinding Tools Chapter \u003cbr\u003e2. Curve Generators, Generating Chapter \u003cbr\u003e3. Small Lens Work Chapter \u003cbr\u003e4. Accessories for Glass Working Chapter \u003cbr\u003e5. Grinding and Polishing Machines Chapter \u003cbr\u003e6. Making and Testing Flats Chapter \u003cbr\u003e7. Telescope Construction Chapter \u003cbr\u003e8. Telescope Accessories Chapter \u003cbr\u003e9. Photography Chapter \u003cbr\u003e10. The Telescope Maker's Workshop.","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40731731525784,"sku":"WBAVTM2","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/cover_atm2.jpg?v=1629379698"},{"product_id":"amateur-telescope-making-vol-1","title":"Amateur Telescope Making, Vol. 1","description":"\u003cp\u003e\u003cstrong\u003eEdited by Albert Ingalls Volume 1.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eProduct Information:\u003c\/strong\u003e 6.00\" by 9.00\", 590 pages, hardbound.\u003cbr\u003e\u003cbr\u003eSubjects covered: Newtonian Telescope Mirror Making; Optical Testing; Workshop Wisdom; and Observatory Buildings.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40731753119896,"sku":"WBAMTM1","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/cover_amtm1.jpg?v=1629380159"},{"product_id":"amateur-telescope-making-vol-2","title":"Amateur Telescope Making, Vol. 2","description":"\u003cp\u003e\u003cstrong\u003eVolume 2\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 6.00\" by 9.00\", 590 pages, hardbound.\u003c\/p\u003e\n\u003cp\u003eSubjects covered: Refractor Telescopes; Telescope Mechanics; Telescope Adjustments; Binoculars; Schmidt Cameras; and Optical Flats.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40731757150360,"sku":"WBAMTM2","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/cover_amtm2.jpg?v=1629380286"},{"product_id":"amateur-telescope-making-vol-3","title":"Amateur Telescope Making, Vol. 3","description":"\u003cp\u003eVolume 3.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eProduct Information:\u003c\/strong\u003e 6.00\" by 9.00\", 630 pages, hardbound.\u003c\/p\u003e\n\u003cp\u003eSubjects covered: Optical Production Methods and Machinery; Eyepieces and Small Lenses; Optical Coatings and Coating Equipment; The Eye and Atmosphere; Other Optical Instruments; and Instrumentation for Solar Observations.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40731763736728,"sku":"WBAMTM3","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/cover_amtm3.jpg?v=1629380432"},{"product_id":"arp-atlas-of-peculiar-galaxies","title":"Arp Atlas of Peculiar Galaxies","description":"\u003cp\u003e\u003cstrong\u003eBy Jeff Kanipe and Dennis Webb\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduction Information:\u003c\/strong\u003e 8.5 by 11 inches, 400 pages (2 lb. 9 oz. ship. wt.), hardbound.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Arp Atlas of Peculiar Galaxies: A Chronicle and Observer's Guide\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eIn 1966, astronomer Halton Arp compiled his Atlas of Peculiar Galaxies, which featured 338 images of some of the strangest looking galaxies and galaxy groups then known to exist. The purpose of the Atlas, Arp stated in his preface, was to graphically present structural peculiarities in galaxies \"\"in order to build a realistic picture of what galaxies are really like.\"\" At the time, astronomers were struggling to formulate a workable taxonomy of \"\"symmetrical\"\" galaxies using classification schemes such as Edwin Hubble's tuning fork diagram. But the Atlas was comprised of the \"\"Elephant Men\"\" of galaxies, and their deformations challenged and defied astronomers' attempts at galaxy classification. \u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eAlthough the Atlas itself has been long out of print, this book not only reproduces all 338 of the original Atlas of Peculiar Galaxie's images, including Arp's preface, it also presents new images of all Arp galaxies taken by amateur astronomers, along with finder charts and observing notes.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eIn addition, it provides a chronicle of Arp's saga, from his early work at Mount Wilson and Palomar, where the original Atlas was assembled, to his controversial research on discordant redshifts.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eAlthough Arp's astrophysical interpretations have sparked controversy among his peers - the giants of professional astronomy - his story has stoked the interests of amateur astronomers throughout the world who want to know more about the man and his catalog of peculiar galaxies.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eIn addition to Arp's story, the book also provides amateurs with a complete guide to observing the Arp galaxies. Today, even with the advent of large-aperture amateur telescopes and affordable CCD cameras, this is admittedly an ambitious undertaking, but the Observing Guide will help put many of these unusual galactic specimens within reach of both observers and imagers. Even with 8 and 10-inch telescopes, the peculiarities of nearly 20 Arp galaxies can be detected.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTHE CHRONICLE INCLUDES:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe processes that make galaxies peculiar\u003c\/li\u003e\n\u003cli\u003eHalton Arp's early life\u003c\/li\u003e\n\u003cli\u003eHis initial work at Mount Wilson and Palomar\u003c\/li\u003e\n\u003cli\u003eHow and why he constructed the Atlas\u003c\/li\u003e\n\u003cli\u003eWhy he left the Carnegie Institute\u003c\/li\u003e\n\u003cli\u003eThe breakup between Carnegie and Caltech\u003c\/li\u003e\n\u003cli\u003eHis controversial work on galaxy-quasar associations\u003c\/li\u003e\n\u003cli\u003eProfiles of some of Arp's most prominent discordant redshifts cases\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTHE OBSERVER'S GUIDE INCLUDES:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA complete catalog of the original 338 Arp galaxy images digitally swept of artifacts (see sample)\u003c\/li\u003e\n\u003cli\u003eA detailed guide to observing the Arp peculiar galaxies\u003c\/li\u003e\n\u003cli\u003e26 sky charts showing the locations of the Arp galaxies by region (see sample)\u003c\/li\u003e\n\u003cli\u003eDetailed tables for each sky chart (see sample)\u003c\/li\u003e\n\u003cli\u003eAmateur images of all 338 Arp galaxies (see sample)\u003c\/li\u003e\n\u003cli\u003eAnnotated schematic diagrams of each galaxy field\u003c\/li\u003e\n\u003cli\u003eGalaxy characteristics and visual observation narratives\u003c\/li\u003e\n\u003cli\u003eArp's explanatory notes from the Atlas\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhatever size telescope you have, however, the point is not to just look for an Arp galaxy, but to observe the unusual structures produced by galactic interactions, gravitational tidal forces, and inherent dynamics. To help you identify these structures, the guide provides detailed diagrams of each Arp field. What can you see? Counter-tails, rings, jets, \"\"wind\"\" effects, plumes, galaxy chains, single- and multi-armed galaxies, and other oddities. 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From then until his retirement in 1993 he was a meteorologist at Brussels Airport. His special interest is spherical and mathematical astronomy. He is a member of several astronomical associations and the author of many scientific papers. He is co-author of Canon of Solar Eclipses (1966, 1983), and the Canon of Lunar Eclipses (1979). His Astronomical Formulae for Calculators (1979, 1982, 1985 and 1988) has been widely acclaimed by both amateur and professional astronomers. He is, with Fred Espenak, one of the authors of Five Millennium Canon of Solar Eclipses (2006) and Five Millennium Canon of Lunar Eclipses (2009). Further works, published by Willmann-Bell, Inc., are Elements of Solar Eclipses 1951–2200 (1989), Transits (1989), Astronomical Algorithms (1991, 1998), and the 5-volume Mathematical Astronomy Morsels series (1997, 2002, 2004, 2007, and 2009). For his numerous contributions to astronomy the International Astronomical Union announced in 1981 the naming of asteroid 2213 Meeus in his honor.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eAbout the Cover Photograph\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eNot all astronomical tables need be written in the familiar tabular form. Here Dennis di Cicco recorded, on a single piece of photographic film, the apparent movement of the sun along the ecliptic for a period of one year. The result—an analemma—is sometimes seen drawn on globes of the world or incorporated into the design of sundials. The camera was rigidly mounted in the same position throughout the year. Using a filter to block all but the sun, 44 separate exposures were made at about seven-day intervals and at precisely 8:30 A.M. EST. Three times during the year, the camera’s shutter was opened at sunrise and closed at 8:25 A.M. EST. The resultant streaks show the diurnal path of the sun near the time of the summer and winter solstices, and the analemma’s crossover point. Finally, to record foreground detail and the background of the sky a normal exposure was made. All told there were a total of 48 exposures. Dennis di Cicco told the fascinating story of how this picture was made in “Exposing the Analemma’’ in the June 1979 issue of Sky and Telescope magazine.","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765327311000,"sku":"TABLESPLANET","price":35.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/3DAstronomicalTables.jpg?v=1629729366"},{"product_id":"best-of-amateur-telescope-making-vol-1-issues-1-through-11","title":"Best of Amateur Telescope Making, Vol. 1 (Issues 1 through 11)","description":"\u003cp\u003e\u003cstrong\u003eEdited by William J. Cook\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eProduct Information: \u003c\/strong\u003e462 pages, 408 illustrations (ATMJ's issues 1 through 11).\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eOver a period spanning nearly 10 years Amateur Telescope Making Journal published articles of interest to the telescope maker. The Best of Amateur Telescope Making presents 150 the best of these articles, fully edited and where appropriate corrected by the original authors, in two volumes totaling nearly 900 pages with 692 illustrations. These are \"\"How to Books\"\" that cover a wide range of subjects of interest to people who design, build and use telescopes for astronomy. A sampling of the subjects are as follows:\u003cbr\u003e\u003cbr\u003eUnobstructed Reflecting Telescopes\u003cbr\u003e17.5-Inch Binocular\u003cbr\u003eA Schupmann Medial Telescope\u003cbr\u003eA Wood and Aluminum Split-Ring Telescope\u003cbr\u003eIndustrial Fabrication of Small Lenses\u003cbr\u003eSub-Aperture Maksutov Correctors\u003cbr\u003eThe Stevick-Paul Off-Axis Reflecting Telescope\u003cbr\u003eA New Equatorial Platform Design\u003cbr\u003eThe Eye and the Use of Telescope Optics\u003cbr\u003eImprove Your Telrad\u003cbr\u003eThe Krupa Collimator\u003cbr\u003eTelescopes For CCD Imaging\u003cbr\u003eThe Maksutov Telescope: Past and Present\u003cbr\u003eBinocular Collimation\u003cbr\u003eTips for the Big Dobsonian Builder\u003cbr\u003eThe Voyager Binocular Telescope\u003cbr\u003eVeiling Glare\u003cbr\u003eMaking Schmidt Correctors\u003cbr\u003eYOLO Reflector\u003cbr\u003eAnnular Baffles for Barlow Lenses\u003cbr\u003eRangefinders and Stereo Telescopes\"\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765411524760,"sku":"WBBAT1","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_AllBestATMJ.jpg?v=1629729792"},{"product_id":"best-of-amateur-telescope-making-vol-2-issues-12-through-18","title":"Best of Amateur Telescope Making, Vol. 2 (Issues 12 through 18)","description":"\u003cp\u003e\u003cstrong\u003eEdited by William J. 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A sampling of the subjects are as follows: Volume 2, 429 pages, 284 illustrations (ATMJ's issues 12 throught 18)\u003cbr\u003e\u003cbr\u003eA 22-Inch Portable Telescope\u003cbr\u003eChoosing a Wide-Field Telescope\u003cbr\u003eMaking Large Thin Mirrors\u003cbr\u003eAn Experimental Portable Observatory\u003cbr\u003eMirror Making and Testing Hints\u003cbr\u003eMirror-O-Matic Polisher\/Grinder\u003cbr\u003eDigital Knife-Edge Test Reduction\u003cbr\u003eDesign and Construction of a Modern Herschelian\u003cbr\u003eScrap Parts and the Life of the ATM\u003cbr\u003eFiguring a Schmidt Corrector\u003cbr\u003eA General-Purpose Yolo You Can Build\u003cbr\u003eEvolution of a 10 x 70 Binocular\u003cbr\u003eTest Methods for Elliptical and Spherical TCT Mirrors\u003cbr\u003eAn 8-inch Siderostat Refractor\u003cbr\u003eAn Ultralight Portable Dobsonian\u003cbr\u003eThe Multi-Schiefspiegler\u003cbr\u003eA Binocular Singlet Refractor\u003cbr\u003ePhase Contrast Testing\u003cbr\u003eA Flat Tester Right Under Your Nose\u003cbr\u003eA Portable Polar Siderostat\u003cbr\u003eLurie Anastigmats\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765514875032,"sku":"WBBAT2","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_AllBestATMJ_7ddbc7d1-60ae-4468-9e9b-0a2efbeb88a7.jpg?v=1629730213"},{"product_id":"bright-star-atlas","title":"Bright Star Atlas","description":"\u003cp\u003e\u003cstrong\u003eBy Wil Tirion and Brian Skiff\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 9.00\" by 10.00\", 32 pages, softbound.\u003c\/p\u003e\n\u003cp\u003eSome years ago we purchased a pair of used binoculars and tucked them away in the car. It's amazing how many times they have come in handy during the daylight hours and it is one of life's little satisfactions to pause beside the road on a starry night and look at the stars.\u003cbr\u003e\u003cbr\u003eAll that was lacking was a nice inexpensive atlas to accompany the binoculars. The \u003cem\u003eBright Star Atlas\u003c\/em\u003e is intended just for this purpose. This 10 map atlas of the night sky is drawn by Wil Tirion and is based upon the Hipparcos and Tycho Catalogs with a stellar limiting magnitude of 6.5.\u003cbr\u003e\u003cbr\u003eOpposite each full page map Brian Skiff of the Lowell Observatory has prepared a tabular listing of interesting objects visible in binoculars or small telescopes. These include galaxies, open clusters, diffuse nebulae, bright nebulae, planetary nebulae, double stars, and variable stars. Atlas includes a set of seasonal star maps to help orient the user to the night sky throughout practically the entire populated world. Objects in Skiff's catalog are also listed in cross referenced tables.\u003cbr\u003e\u003cbr\u003eIdeal companion atlas to the larger \u003cem\u003eSky Atlas 2000.0\u003c\/em\u003e or \u003cem\u003eUranometria 2000.0\u003c\/em\u003e.\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy, film laminated covers\u003c\/li\u003e\n\u003cli\u003e6 Seasonal finder charts good anywhere in the world.\u003c\/li\u003e\n\u003cli\u003e10 \u003cem\u003eBright Star Atlas\u003c\/em\u003e Maps\u003c\/li\u003e\n\u003cli\u003eStars limiting magnitude is 6.5 based upon the Hipparcos\/Tycho catalog.\u003c\/li\u003e\n\u003cli\u003eData for 612 objects (Position, size, magnitude, etc) presented in both summary tables and conveniently opposite each map for quick reference.\u003c\/li\u003e\n\u003cli\u003eVariable Stars 135\u003c\/li\u003e\n\u003cli\u003eEclipsing 32\u003c\/li\u003e\n\u003cli\u003ePulsating 69\u003c\/li\u003e\n\u003cli\u003eEruptive 13\u003c\/li\u003e\n\u003cli\u003eOther 21\u003c\/li\u003e\n\u003cli\u003eDouble Stars 200\u003c\/li\u003e\n\u003cli\u003eOpen Clusters 100\u003c\/li\u003e\n\u003cli\u003eOpen Clusters Associated with Nebulosity 15\u003c\/li\u003e\n\u003cli\u003eGlobular Clusters 46\u003c\/li\u003e\n\u003cli\u003ePlanetary Nebulae 41\u003c\/li\u003e\n\u003cli\u003eGalaxies 115\u003c\/li\u003e\n\u003cli\u003eAll 110 Messier Objects\u003c\/li\u003e\n\u003cli\u003eConstellation Summary Table (Name, Pronunciation, Meaning, Possessive Form, Abbreviation and Map location.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eISBN:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e978-0943396279\u003c\/span\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765538762904,"sku":"WBBSA","price":10.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_BriteStar.jpg?v=1629730348"},{"product_id":"epic-moon","title":"Epic Moon","description":"\u003cp\u003e\u003cstrong\u003eBy William P. Sheehan and Thomas A. Dobbins.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e Hardbound, 6 by 9 inches, 364 pages, 186 Illustrations.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eAbout Epic Moon, A History of Lunar Exploration in the Age of the Telescope\u003cbr\u003eThe Moon has always been one of the most obvious and in some ways the most enticing astronomical objects – even from early times, it was Queen of the Night, and the naked eye sees more detail than even the largest telescopes reveal on Mars.\u003cbr\u003e\u003cbr\u003eAs early as 1609 Galileo’s first telescope showed the Moon to be another world. The Moon has thus been the object of intense study not only since the 1960s but for at least the previous three and a half centuries. The eye arrived before the boot. By the same token, the first “race to the Moon” was not undertaken by American astronauts and Soviet cosmonauts but by German and British selenographers in the nineteenth century, who mapped lunar detail so painstakingly that by 1878 – the year Julius Schmidt of the Athens Observatory\u003cbr\u003epublished his great Moon map and also the year that Congress organized the United States Geological Survey\u003cbr\u003eand assigned to it the task of making large-scale maps of the United States and its territories – it could be said\u003cbr\u003ewithout exaggeration that the earthward hemisphere of the Moon had been depicted in greater detail and with more precision than many parts of the American West were depicted in existing maps of the time.\u003cbr\u003e\u003cbr\u003eIn part, the reason for the long preoccupation with lunar surface details lay in the fact that the mapping of the Moon provided a form of therapy for astronomically inclined obsessive personalities, whose monomaniacal tendencies were drawn to the seemingly inexhaustible project of recording the multitudinous features visible in even a six-inch telescope. In part, too, it lay in the partiality of selenographers for the project – first systematically pursued by Johann Schroeter, the Lilienthal magistrate, at the end of the eighteenth century – of discovering evidence of minor changes in the lunar surface. What became a Promethean quest for changes – veils, clouds, landslips, eruptions – was initially tied in with the theory that the lunar surface features had been formed by volcanic eruptions; however, it curiously survived the demise of the volcanic theory and still shows intermittent gasps of life in the largely amateur-driven search for transient lunar phenomena, or TLP.\u003cbr\u003e\u003cbr\u003eThe long era of pre-Apollo lunar studies is a fascinating subject that has never been told in detail. “No other book, recent or not-so recent, is devoted to the history of lunar studies with telescopes” (Clark R. Chapman). Though there was a lapse of interest in the Moon in the immediate post-Apollo era, there has been a recent “return to the Moon” with the successful Clementine and Lunar Prospector missions. There is also growing evidence of a return of amateur observers to the Moon as an object worthy of their attentions. This is understandable inasmuch as the Moon remains the most accessible planetary realm; it is, moreover, the only alien world open to geological prospecting from the eyepiece of the backyard telescope.\u003cbr\u003e\u003cbr\u003eIn that sense, this book is – like the Moon itself – both timely and timeless. The story of mankind’s endless fascination with the world of the Moon and the gallery of interesting characters who pursued the details of the lunar surface with often strange intensity is a modern-day epic. Many of the stories recounted for the first time here will still be recounted generations hence, when the Apollo explorations may seem a mere interlude in what has actually been a more sustained and more significant era of endeavour. It is possible that the names of Schroeter, Beer and Madler, Webb and Schmidt may prove to be as memorable as those of Armstrong, Aldrin, Cernan and Schmitt.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eAbout The Authors:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eA psychiatrist with a lifelong interest in astronomy, William P. Sheehan is a contributing editor of Sky \u0026amp; Telescope magazine, a member of the History of Astronomy Division of the American Astronomical\u003cbr\u003eAssociation, and a consultant to Committee 41 (History) of the International Astronomical Union. 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The original edition (published in 1962) has been radically revised, and emphasis is placed on computation. The numerical analysis needed for the computations is derived, and sample programs (run on a IBM-PC) are included. There are introductory chapters on the astronomical background and on vectorial mechanics. Sections dealing with the problem of two bodies include the use of universal variables, several methods (including that of Laguerre) for solving Kepler's equation, and three methods for solving the two point boundary value problem. The chapter on the determination of orbits includes two versions of Gauss' method, the application of least squares and an introduction to recursive methods. The chapter on numerical methods has been expanded, and includes three methods for the numerical integration of differential equations, one of which has full stepsize control. 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Robert describes how the family digital camera you probably already own can be used to take spectacular pictures of the night sky. This is especially true if you have purchased a digital camera within the past several years - even some entry level point-and-shoot digital cameras take pictures of the Moon and planets that rival or exceed the best film images. 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Freed from that limitation, the author uses today’s computers to address each topic with a rigor and finesse beyond the wildest dreams of any old-time practitioner.\u003cbr\u003e\u003cbr\u003eAfter winning worldwide acclaim for his trailblazing Astronomical Formulae for Calculators (Willmann-Bell, 1982) and Astronomical Algorithms (1991), he has harnessed the powerful techniques presented in these works, along with other methods from his repertoire, for the novel applications covered here. For some really long-term studies he has collaborated with Aldo Vitagliano (University of Naples), the creator of Solex, a remarkable program for solar-system motions that can be freely downloaded from the Internet.\u003cbr\u003e\u003cbr\u003eI’m struck by the fact that we now live in “long gaps” between certain types of celestial occurrences, making it appear that they never occur. But that’s a mistake. For example, there is probably no one alive today who remembers seeing the planet Venus go south of the bright star Antares in 1914 or 1922, and we learn in Chapter 37 that Venus won’t repeat this performance until 2109. Similarly, Jupiter hasn’t occulted Saturn (as seen from Earth) since before the pyramids of Egypt were built; the next time will be in A.D. 7541, and it does so twice in that year!\u003cbr\u003e\u003cbr\u003eAs if to make up for these long waits, current generations of skywatchers are being specially treated to transits of Venus, rare though they are. Such transits have a nice way of coming in pairs, as in 2004 and 2012. But that will end about 1,800 years from now, after which a person will get exactly one chance in a lifetime to see a Venus transit — unless, by then, the human life expectancy exceeds 105 to 138 years.\u003cbr\u003e\u003cbr\u003eMake no mistake, many of the intricate calculations described in this book were beyond our grasp just a few years ago. Or maybe someone attempted them and gave the wrong answers, with no one being the wiser. The French public adored Camille Flammarion, a charismatic champion of astronomy in the late 19th and early 20th centuries. The erroneous value he promulgated for the longest possible total solar eclipse still turns up occasionally today, as we find out in Chapter 10.\u003cbr\u003e\u003cbr\u003eMany surprises lurk in these pages. As schoolchildren we learned that a solar eclipse can occur only at a New Moon, and a lunar eclipse at a Full Moon. It is also true (as more advanced courses teach) that an extreme apogee or perigee of the Moon can happen only near one of these same two phases. So it’s intriguing to discover in the book’s first chapter that an extreme apogee or perigee can never coincide with an eclipse.\u003cbr\u003e\u003cbr\u003eDid you know that the shape of a solar eclipse track depends on the calendar month in which it occurs, and that in the arctic regions there can be an eclipse of the midnight Sun? Moreover, our star can indeed come to a halt in the daytime sky, as if obeying Joshua’s biblical command, “Sun, stand thou still.” It does so routinely, twice each day, as viewed from the surface of the planet Mercury!\u003cbr\u003e\u003cbr\u003eWhen three planets form a nearly perfect line in space, who but an Albert Einstein (or a Jean Meeus) would have foreseen that the velocity of light plays a vital role in what is (or is not) seen by observers on the two end planets? Chapter 46 cites six actual dates when one observer would see an occultation by the middle planet, and the other a near miss, due to a difference in the travel time of light to each observer.\u003cbr\u003e\u003cbr\u003eOnly a curmudgeon could say that investigations like these, having no obvious purpose, are not worth pursuing. Let’s be glad the great astronomer Joseph Louis Lagrange didn’t have that attitude, back in 1772, when he first described how a tiny body (now called a Trojan asteroid) could permanently trail behind or lead the way for a major planet going around the Sun. Lagrange worked at a time when not a single asteroid of any type, let alone a Trojan, had been spotted in a telescope. Many hundreds of Trojans are known today, and we learn in Chapter 24 that the statistics of their orbits have certain peculiarities yet to be explained. Perhaps this purely “recreational” book will inspire a budding theoretician to make a future advance in celestial mechanics.\u003cbr\u003e\u003cbr\u003eAs I write these lines, Sky \u0026amp; Telescope magazine has just reinstated (after 36 years) the monthly question-and-answer section that so delighted me as a teenage subscriber living in rural Virginia. Today, as then, the magazine receives all sorts of innocent queries about the planets and the sky that are easy to pose but very tricky to answer with authority. For help in preparing our answers we consult various experts, run software simulations, and check the papers published in obscure journals. But I’ll let you in on a secret. On the bookshelf by my desk, right alongside its predecessors, I’m adding Jean Meeus’s latest Morsels as a prime editorial resource.\u003cbr\u003eRoger W. Sinnott\u003cbr\u003e\u003cem\u003eSenior Editor, Sky \u0026amp; Telescope magazine\u003c\/em\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eNotes on Dates and Time Reckoning\u003cbr\u003eThe Moon\u003cbr\u003e1 Extreme perigees and apogees of the Moon - mystery solved\u003cbr\u003eEclipses\u003cbr\u003e2 Years with five solar eclipses\u003cbr\u003e3 Two eclipses in northern Siberia and the period of 10 years\u003cbr\u003e4 Similar eclipse paths\u003cbr\u003e5 Solar eclipses with long central lines\u003cbr\u003e6 Solar eclipses: shapes of central lines\u003cbr\u003e7 Annular-total solar eclipses\u003cbr\u003e8 Broken-ring eclipses\u003cbr\u003e9 About solar eclipses of type IV\u003cbr\u003e10 The maximum duration of a total solar eclipse\u003cbr\u003e11 The time interval between two successive solar eclipses\u003cbr\u003e12 The shortest time interval between two totalities at the same place\u003cbr\u003e13 Accumulating totalities\u003cbr\u003e14 About crossing central lines\u003cbr\u003e15 Large solar eclipses at the Poles\u003cbr\u003e16 Where does greatest eclipse occur?\u003cbr\u003e17 Just-missing partial \"\"eclipses\"\"\u003cbr\u003e18 About Saros and Inex series\u003cbr\u003e19 Eclipse duos\u003cbr\u003e20 Magnitude, ratio and obscuration\u003cbr\u003e21 Lunar tetrads\u003cbr\u003e22 About solar and lunar eclipses\u003cbr\u003e23 Exotic eclipses\u003cbr\u003ePlanetary Motions\u003cbr\u003e24 The Trojans\u003cbr\u003e25 Asteroid 63252 and Comet Lexell\u003cbr\u003e26 Iris and Metis\u003cbr\u003e27 Close approaches between asteroids\u003cbr\u003e28 Planets and the Latus Rectum\u003cbr\u003e29 About the perihelia of Saturn\u003cbr\u003e30 Planetary perturbations\u003cbr\u003e31 True and apparent distances\u003cbr\u003e32 Surface gravity and escape velocity\u003cbr\u003e33 About the synodic period of a satellite\u003cbr\u003ePlanetary Phenomena\u003cbr\u003e34 More than one opposition in one year?\u003cbr\u003e35 The axial tilt of Mercury\u003cbr\u003e36 The motion of the Sun in the sky of Mercury\u003cbr\u003e37 Venus and Antares\u003cbr\u003e38 Shadows on Jupiter\u003cbr\u003e39 Jupiter with only one visible satellite\u003cbr\u003e40 Jupiter: triple satellite phenomena\u003cbr\u003e41 Transits of Venus and Mercury: some secular variations\u003cbr\u003e42 Another list of Venus transits\u003cbr\u003e43 Transits of Venus: local durations\u003cbr\u003e44 Simultaneous transits\u003cbr\u003e45 More simultaneous transits\u003cbr\u003e46 Mutual occultations of planets (off-Earth)\u003cbr\u003eOn the Celestial Sphere\u003cbr\u003e47 Can Venus be visible at midnight?\u003cbr\u003e48 Simultaneous greatest elongations\u003cbr\u003e49 Simultaneous inferior conjunctions\u003cbr\u003e50 The planets' greatest declinations\u003cbr\u003e51 Diurnal path and horizon\u003cbr\u003e52 More sunshine near the Polar Circles\u003cbr\u003eVaria\u003cbr\u003e53 Pursuing the Sun\u003cbr\u003e54 Galileo's first records of Jupiter's satellites\u003cbr\u003e55 Planetographic and planetocentric latitudes\u003cbr\u003e56 Friday the 13th\u003cbr\u003e57 A sky full of moons?\u003cbr\u003eIndex\u003cbr\u003e \u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eAbout The Author\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eJean Meeus, born in 1928, studied mathematics at the University of Louvain (Leuven) in Belgium, where he received the Degree of Licentiate in 1953. From them until his retirement in 1993, he was a meteorologist at Brussels Airport. His special interest is spherical and mathematical astronomy. He is a member of several astronomical associations and the author of many scientific papers. He is co-author of Canon of Solar Eclipses (1966), the Canon of Lunar Eclipses (1979) and the Canon of Solar Eclipses (1983). His Astronomical Formulae for Calculators (1979, 1982, 1985 and 1988) has been widely acclaimed by both amateur and professional astronomers. Further works, published by Willmann-Bell, Inc., are Elements of Solar Eclipses 1951-2200 (1989), Transits (1989), Astronomical Algorithms (1991), Astronomical Tables of the Sun, Moon and Planets (1983 and 1995), Mathematical Astronomy Morsels (1997), More Mathematical Astronomy Morsels (2002) and Mathematical Astronomy Morsels III (2004). For his numerous contributions to astronomy the International Astronomical Union announced in 1981 the naming of asteroid 2213 Meeus in his honor.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765634478232,"sku":"WBMM3","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_MorselsIII.jpg?v=1629731188"},{"product_id":"mathematical-astronomical-morsels-iv","title":"Mathematical Astronomical Morsels IV","description":"\u003cp\u003e\u003cstrong\u003eBy Jean Meeus.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e Hardbound, 6 by 9 inches, 373 pages.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eIn his Preface to Mathematical Morsels III Jean Meeus writes: We are living in a period of important astrophysical and cosmological research. Many astronomical journals and scientific books deal with subjects such as birth and evolution of stars, black holes, dark matter, gamma-ray bursts, supernova remnants or collisions between galaxies. Of course this is important matter, but one almost seems to have forgotten the `old' astronomy, the classical, mathematical science of the sky. And yet, without this fundamental astronomy modern research on the universe new would never have been possible.\u003cbr\u003e\u003cbr\u003eAnd to this Roger Sinnott responded “In his Preface the author hints that some readers might accuse him of practicing “old” astronomy. Don't let that fool you. The problems he tackles would have fascinated astronomers of the early 20 th and prior centuries, but those poor souls faced a brick wall of computational difficulty. They had to work out all their answers laboriously, with a pencil and paper. Freed, from that limitation, the author uses today's computers to address each topic with a rigor and finesse beyond the wildest dreams of any old-time practitioner.\u003cbr\u003e\u003cbr\u003eThis conversation continues in this “Morsels IV” where Jean Meeus concludes his Preface as follows: Certainly this book will not make astronomy to progress. Rather, most subjects discussed in this book belong to what might be called recreational astronomy. While making the calculations and writing the text, we felt being as Sir Arthur Conan Doyle wrote in The Hound of the Basikerville\u003cbr\u003e\u003cbr\u003eA dabbler in science, Mr. Holes, a picker up of shells on the shores of the great unknown ocean.\u003cbr\u003e\u003cbr\u003eAnd not too far into this book he cites Maurice Ravel's Une Barque sur l'Océan (a boat at sea) piano piece as launching point into a study of when a horizon skimming Moon might look like a boat at sea. Interested? Here are 68 more subjects that have washed upon the beach of Jean Meeus ' imagination.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765682843800,"sku":"WBMM4","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_MorselsIV.jpg?v=1629731510"},{"product_id":"mathermatical-astronomical-morsels-i","title":"Mathematical Astronomical Morsels I","description":"\u003cp\u003e\u003cstrong\u003eBy Jean Meeus.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 6.00\" by 9.00\", 400 pages, hardbound.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFrom The Foreword\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eEvery time two full moons occur in the same month, pundits in the media take note. They explain that, according to folklore, the rare second one is called a blue moon—whence the saying, “once in a blue moon.” However, they have got it backwards, says Philip Hiscock of the Folklore and Language Archive, Memorial University of Newfoundland. The fabled blue moon, meaning any rare or unusual occurrence, dates back at least 150 years in the English language. The link to lunar phases in a calendar month is quite recent. Hiscock traces it to an obscure children's book published in 1985, followed the next year by a question card in the game of Trivial Pursuit!\u003cbr\u003e\u003cbr\u003eMeanwhile, hardly a week goes by in the Internet's astronomy areas without a total novice dropping in to ask, “What about the alignment of planets coming in May of the year 2000? Are we in danger of a tidal wave or a massive earthquake?” A replay seems brewing of the public alarm over the supposed syzygy of 1982 March 10, widely touted as something that occurs once every 179 years.\u003cbr\u003e\u003cbr\u003ePop-culture obsessions like these do not originate in the magazines for amateur astronomers, let alone in scientific journals or textbooks. But they say something important about our society. Here we have naive but sincere people, whose astronomical curiosity has been stirred for perhaps the first time in their lives. Their interest will soon wane unless a teacher, commentator, or writer they respect can step in with a meaningful response. Even worse, their end-of-the-world fears may escalate.\u003cbr\u003e\u003cbr\u003eJean Meeus's latest book explores the frequency of blue moons, planetary groupings, and a great deal more, as only this master of astronomical calculations could. He predicted the May 2000 alignment in an article for Sky \u0026amp; Telescope magazine in December 1961, but without spreading the doomsday concern, of course. He has brought together these and other tidbits from his voluminous writings, spanning nearly half a century, on every sort of celestial configuration, cycle, and curiosity. His wide following in America can now enjoy these penetrating analyses, many of which originally appeared only in Europe. The collection is much more than mere anthology. Each conclusion has been checked, and virtually every numerical result calculated afresh, with all the rigor we have come to expect.\u003cbr\u003e\u003cbr\u003eThis Belgian astronomer is particularly attracted to the rarest of all celestial occurrences—things almost impossible to find by paging through almanacs or scrolling through time with a computer's planetarium program. For example, he investigates how often a bright star or planet is occulted by the moon during a total lunar eclipse. He looks at how many times per century Jupiter can appear \"\"without a visible moon,\"\" all the Galilean satellites being either in front of the disk, behind it, or in eclipse. He goes on to examine another elusive event, one that the English amateur Horace Dall was lucky enough to photograph with his 15-inch reflector on 1956 April 21: the shadow of not one, not two, but three satellites crossing Jupiter's disk at once! This book lists the occasions when we, too, can hope to witness something similar during our lifetimes.\u003cbr\u003e\u003cbr\u003eThe detection of patterns and cycles is a theme pursued throughout. Most readers have probably heard about the Saros in connection with solar eclipses, or the eight-year cycle of Venus risings that is a cornerstone of the Maya calendar. But here we find evidence for the half Saros (about 3293 days), for which the author proposes the name Sar. A mysterious 586-year period also emerges among the lunar eclipses. It is so long a span that a few writers have fallen into a statistical trap. Using data for the entire 20th and 21st centuries, they have concluded that total lunar eclipses are more common than partial ones. Wrong! As Jean Meeus demonstrates with his beautiful diagram of eclipse clumps (page 104), the opposite is true over the long haul.\u003cbr\u003e\u003cbr\u003eMany celestial cycles are fleeting, destined to fade away after a few iterations as others overlap them or start up afresh. It is a fallacy to think that you can recreate planetary motions for many years by spinning back or fast-forwarding a planetarium projector. Only someone with a profound grasp of astronomical motions and relationships could have produced an authoritative book like this.\u003cbr\u003e\u003cbr\u003eSome readers will see here an antidote to the claims of astrology. Others will gain a deep insight into the misuse of statistics, especially in such areas as the sunspot cycle and its relation to weather on Earth. But all of us can acquire plenty of ammunition to settle bets at star parties, test computer programs, and amaze our friends (or an astronomy professor) with some little-known surprises about the sky and calendar.\u003cbr\u003e\u003cbr\u003eSo why exactly does Christmas fall more often on a Tuesday than on a Monday? How many centuries will elapse before 10 successive Easters occur in April? What is the reason that total solar eclipses are more common for observers in the Northern Hemisphere than in the Southern? Turn these pages, and you'll find out!\u003cbr\u003e\u003cbr\u003eRoger W. Sinnott\u003cbr\u003e\u003cem\u003eSenior Editor, Sky \u0026amp; Telescope magazine\u003c\/em\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTable of Contents\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eNotes on Dates and Time Reckoning\u003cbr\u003e\u003cbr\u003eTHE MOON\u003cbr\u003e 1. The Instantaneous Lunar Orbit\u003cbr\u003e 2. The Extreme Values of the Distance of the Moon to the Earth\u003cbr\u003e 3. The Distribution of the Moon's Perigee and Apogree Distances\u003cbr\u003e 4. What is the Mean Value of the Earth-Moon Distance?\u003cbr\u003e 5. Extreme Declinations of the Moon\u003cbr\u003e 6. The Librations of the Moon\u003cbr\u003e 7. Months With Five Lunar Phases\u003cbr\u003eECLIPSES AND OCCULTATIONS\u003cbr\u003e 8. The Number of Eclipses in a Year\u003cbr\u003e 9. Solar Eclipses: Some Periodicities\u003cbr\u003e 10. Curious and Interesting Facts About Solar Eclipses\u003cbr\u003e 11. Regions of Visibility of Solar Eclipses\u003cbr\u003e 12. When is the Northern Limit the Southern One?\u003cbr\u003e 13. The Frequency of Total and Annular Solar Eclipses for a Given Place\u003cbr\u003e 14. Total and Annular Solar Eclipses in Close Succession at a Given Place\u003cbr\u003e 15. Nearly-Zenithal Central Solar Eclipses\u003cbr\u003e 16. Curious and Interesting Facts About Lunar Eclipses\u003cbr\u003e 17. Total Penumbral Lunar Eclipses\u003cbr\u003e 18. The Half-Saros\u003cbr\u003e 19. Series of Occultations\u003cbr\u003e 20. Occultations of Bright Stars by the Moon\u003cbr\u003e 21. Series of Occultations of Saturn\u003cbr\u003e 22. Occultations of Bright Stars by the Eclipsed Moon\u003cbr\u003e 23. Occultations of Planets by the Eclipsed Moon\u003cbr\u003e 24. Occultations of Planets by the Eclipsed Sun\u003cbr\u003e 25. Occultations of Bright Stars by Planets\u003cbr\u003ePLANETARY MOTIONS\u003cbr\u003e 26. The Barycenter of the Solar System\u003cbr\u003e 27. On the Passages of Earth in Perihelion\u003cbr\u003e 28. Periheloids and Apheloids\u003cbr\u003e 29. A Periodicity of 179 Years?\u003cbr\u003e 30. Planetary Quadrants and Planetary Sectors\u003cbr\u003e 31. How Often are the Planets Aligned?\u003cbr\u003e 32. On `Remarkable' relations between the Mean Motions of the Planets\u003cbr\u003e 33. Ceres and Pallas, and Other Couples\u003cbr\u003e 34. Seneca, Orthos, and Quetzalcoatl\u003cbr\u003e 35. Defining Asteroids of the Apollo and Amor Types\u003cbr\u003e 36. The Periodic Comet Encke and Jupiter\u003cbr\u003e 37. The Orbital inclinations of the Four Galilean Satellites\u003cbr\u003ePLANETARY PHENOMENA\u003cbr\u003e 38. Planetary Motions: Approximate Periodicities\u003cbr\u003e 39. Opposition Loops\u003cbr\u003e 40. Opposition Places\u003cbr\u003e 41. Triple Conjunctions\u003cbr\u003e 42. Planetary Groupings\u003cbr\u003e 43. Periodicities in the Phenomena of the Satellites of Jupiter\u003cbr\u003e 44. Jupiter and Triple Shadow Phenomena\u003cbr\u003e 45. Jupiter Without Satellites\u003cbr\u003eON THE CELESTIAL SPHERE\u003cbr\u003e 46. Heliacal Rising and Settings\u003cbr\u003e 47. The Positions of Uranus, Neptune, Pluto and Ceres at their Discovery Dates\u003cbr\u003e 48. Ecliptic and Galactic Equator\u003cbr\u003e 49. The Equinoctial and Solstitial Points and the Constellations\u003cbr\u003e 50. The Declination of Polaris\u003cbr\u003e 51. Alpha is Not Always the Brightest\u003cbr\u003eSTATISTICS, ETC.\u003cbr\u003e 52. The Mean Frequency, Yes, but\u003cbr\u003e 53. Statistics: Danger!\u003cbr\u003e 54. Sunspots and the Weather\u003cbr\u003e 55. Solar Activity and the Brightness of Lunar Eclipses\u003cbr\u003eVARIA\u003cbr\u003e 56. The Equation of Time\u003cbr\u003e 57. About the Equinoxes and the Solstices\u003cbr\u003e 58. The Weekday of Christmas Day\u003cbr\u003e 59. The Distribution of Easter Sundays\u003cbr\u003e 60. The Date of Easter - Some Interesting Data\u003cbr\u003e 61. Rounding Numbers\u003cbr\u003e 62. Predicting Sunspot Activity\u003cbr\u003eINDEX\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eAbout The Author\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eJean Meeus, born in 1928, studied mathematics at the University of Louvain (Leuven) in Belgium, where he received the Degree of Licentiate in 1953. From them until his retirement in 1993, he was a meteorologist at Brussels Airport. His special interest is spherical and mathematical astronomy. He is a member of several astronomical associations and the author of many scientific papers. He is co-author of Canon of Solar Eclipses (1966), the Canon of Lunar Eclipses (1979) and the Canon of Solar Eclipses (1983). His Astronomical Formulae for Calculators (1979, 1982, 1985 and 1988) has been widely acclaimed by both amateur and professional astronomers. Further works, published by Willmann-Bell, Inc., are Elements of Solar Eclipses 1951-2200 (1989), Transits (1989), Astronomical Algorithms (1991), Astronomical Tables of the Sun, Moon and Planets (1983 and 1995), Mathematical Astronomy Morsels (1997) and More Mathematical Astronomy Morsels (2002). For his numerous contributions to astronomy the International Astronomical Union announced in 1981 the naming of asteroid 2213 Meeus in his honor.\"\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765687333016,"sku":"WBMM1","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_Morsels.jpg?v=1629731609"},{"product_id":"optical-testing","title":"Optical Testing","description":"\u003cp\u003e\u003cstrong\u003eBy Joseph M. Geary.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e Hardbound, 6 by 9 inches, 604 pages, 660 illustrations.\u003c\/p\u003e\n\u003cp\u003eOptical Testing — A Practical Introduction for Scientists, Engineers, Optical Designers, Students and Optical Workshop Personnel is written for those working in optics with a practical introduction to optical testing methodologies, instrumentation, and procedures, and assist in the development of their professional careers.\u003cbr\u003e\u003cbr\u003eNo optical component or system should be built without a prior specification which defines base parameters, tolerances, and system performance. Optical testing is done to verify whether the specification and performance criteria have been met. Customers need to make sure that they get what they pay for. Providers are bound both by moral and contractual obligations to provide what the customer ordered at the price quoted. Thus, the need for optical testing is incumbent upon both sides of the transaction, and both should have sufficient testing capabilities to validate the resulting optical product.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765699752088,"sku":"WBOT","price":60.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/home_OptTest.jpg?v=1629731785"},{"product_id":"practical-computer-aided-lens-design","title":"Practical Computer-Aided Lens Design","description":"\u003cp\u003e\u003cstrong\u003eBy Gregory Hallock Smith.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e Hardbound, 6 by 9 inches, 524 pages.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe introduction of the computer revolutionized the way lenses (optical systems) are designed and evaluated. Gone is the drudgery of the past. Gone are the arcane methods. Today the process of designing lenses is more direct, much faster, and infinitely easier.\u003cbr\u003e\u003cbr\u003eThe advent of the personal computer and affordable optical design software has extended this revolution. These latest advances allow more people to design lenses than ever before.\u003cbr\u003e\u003cbr\u003ePractical Computer-Aided Lens Design tells how to design and evaluate lenses using computers. The approach is general and fundamental, and is not limited to one specific software program. Thus, this book should be useful for many years to come.\u003cbr\u003e\u003cbr\u003eIf you are interested in lenses, lens design can also be an exciting and creative experience, and an attempt has been made to convey this feeling to the reader.\u003cbr\u003e\u003cbr\u003eThree groups of readers are intended:\u003cbr\u003e\u003cbr\u003eCollege students studying optics\u003cbr\u003eNon-optical scientists and engineers who wish to design optics using programs like ZEMAX® , OSLO® , CODE V®, and SYNOPSYSTM.\u003cbr\u003eFeatures in this book:\u003cbr\u003e\u003cbr\u003eOptical design concepts and techniques are explained\u003cbr\u003eMany design examples are worked and the results discussed\u003cbr\u003eThe latest computer-aided methods are used\u003cbr\u003eA practical and intuitive approach is emphasized\u003cbr\u003eHardbound, 6 by 9 inches, 524 pages\u003cbr\u003eRead a sample chapter: “The Cooke Triplet and Tessar Lenses” in PDF.\u003cbr\u003e\u003cbr\u003eFrom a Review in the Optical Society of America's\u003cbr\u003eOptics and Photonics News\u003cbr\u003e\u003cbr\u003eAn engineering professor of mine once made a distinction between “computer-aided”design and “computer-ated”design. His point, of course, was that the computer can be used as a tool in the creative idea phase of a design, as well as to assist with the computational grunt work needed to bring a project to completion. Reflecting the author's years of industrial experience, Gregory H. Smith's Practical Computer-Aided Lens Design does an excellent job of covering both aspects of the lens design process.\u003cbr\u003e\u003cbr\u003eThe first 12 chapters cover the standard textbook topics of ray tracing, aberrations, diffraction, modulation transfer function and radiometry, all of which are needed for a conceptual understanding of the design types that follow. The writing is clear and well-organized. The topics are all covered from the point of view of the experienced lens designer. As a result, Smith also includes material not typically found in other texts, such as his discussion of the cosine-fourth law (Sec. A.9.5), and how to design around it (“... strong negative power in the front and rear elements and positive power in the middle...”).\u003cbr\u003e\u003cbr\u003eThe next four chapters introduce specifics of lens design principles. Chapter 13, on merit functions, is a useful gem, detailing practical Zemax (and sometimes Oslo and Code V) listings on program usage. Also included in these chapters are design hints such as “Perhaps the most valuable aberration-control operands address longitudinal color, spherical aberration, coma, and distortion”(p. 176) and “Throughout the practice of lens design, glass selection is often the most subtle issue of all”(p. 193).\u003cbr\u003e\u003cbr\u003eSmith also covers practical aspects of specific design architectures such as doublets, the Cooke triplet, the double Gauss, and Cassegrain and Schmidt telescopes. Covered in the final seven chapters, these examples—or engineering case studies—are an excellent way for the beginner to quickly master the important aspects of a design. So if you are learning lens design as an undergraduate or graduate student, or don't yet have the years of experience which went into writing this book, you will find Practical Computer-Aided Lens Design a valuable investment.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765707911320,"sku":"WBPCAD","price":60.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_PracLens.jpg?v=1629731856"},{"product_id":"schupman-telescope","title":"Schupmann Telescope","description":"\u003cp\u003e\u003cstrong\u003eBy James Daley.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e Hardbound, 6 by 9 inches, 200 pages.\u003c\/p\u003e\n\u003cp\u003ePerfecting the refracting telescope has frustrated lens designers and glass makers since the invention of the telescope. This is because when using standard crown and flint glasses, residual longitudinal color (its dominant defect) cannot be reduced to an optically harmless value. Even today, the most expensive special glass apochromats show some noticeable color, especially at the limits of the visual spectrum.\u003cbr\u003e\u003cbr\u003eHowever, for over 106 years a refractor design has been available that is totally free of harmful color defects. Employing but one glass type, this design, called a Schupmann medial after its inventor Ludwig Schupmann, achieves amazing performance. It is this neglected telescope, along with its close relative the brachymedial, that this book describes in detail, along with an historical account, a discussion of the Schupmann’s role in modern amateur research, system principles and practical applications. Also included are design prescriptions and construction information giving the advanced telescope maker a new world to explore. Here for the first time is a comprehensive discussion of the design and fabrication of these high resolution instruments. Many successful medials are shown in a photo gallery, giving the builder a wealth of further ideas.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765711941784,"sku":"WBST","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_SchupTel.jpg?v=1629731921"},{"product_id":"solar-astronomy-handbook","title":"Solar Astronomy Handbook","description":"\u003cp\u003e\u003cstrong\u003eEdited by Rainer Beck, Heinz Hilbrecht, Klaus Reinsch and Peter Völker.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 6 by 9 inches, hardbound, 546 pages.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr\u003eThe Solar Astronomy Astronomy Handbook is not so much about the Sun, but about the opportunities for amateur astronomers to observe the Sun. Compared with other areas of astronomy solar observing has a number of advantages:\u003cbr\u003e\u003cbr\u003eObservation can be carried out during the day. You do not have to stay up all night and arrive at work the next day exhausted!\u003cbr\u003eThere is an abundance of light. Unlike \"\"Deep Sky\"\" astronomy you actually have to discard much of the light reaching your telescope.\u003cbr\u003eYou can set up your observatory in your own backyard — even in the city -there is no need to escape light pollution at remote locations.\u003cbr\u003eObservations can be made practically every clear day and some simple programs like sunspot counts can be done in just a few minutes.\u003cbr\u003eYou do not need a monster telescope, even a small telescope will show an amazing amount of detail.\u003cbr\u003eThe view is constantly changing, the Sun's appearance has never been, nor will it ever be exactly the same as today.\u003cbr\u003eThis book was conceived and written by a group of German amateur observers. Each section was the responsibility of the amateur who had made that aspect of solar astronomy his specialty.\u003cbr\u003e\u003cbr\u003eThe emphasis was on the practical and covers the kind of solar astronomy within the reach of most amateurs. Soon after publication it was declared by many reviewers as the \"\"standard work\"\" and much correspondence reached the authors from abroad requesting an English translation.\u003cbr\u003e\u003cbr\u003eIn terms of content the basic information in the original German edition will be found here. Where necessary, updating has taken place and errors have been corrected. Numerous passages were revised taking into account the larger, inter-national circle of readers, many pictures have been added and references to German-language literature have been changed, where possible, to appropriate English-language works.\u003cbr\u003e\u003cbr\u003eThe book is divided into four major parts. Part A describes instruments used in solar astronomy, offers help in making decisions with regard to buying, and provides instructions for those who might build their own instrument. Part B deals with the many different amateur observation possibilities. Part C gives encouragement and help in planning and carrying out expeditions to observe solar eclipses and gives details on observation. Part D is an extensive bibliography especially tailored for the amateur solar astronomer. Each chapter of the book is self-contained in terms of contents and the reader can turn to those subjects which interest him or her the most. Numerous cross-references are embedded within the text to point the reader to related sections.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765717086360,"sku":"WBSAH","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_SolarAstro.jpg?v=1629731988"},{"product_id":"engineering-design-and-construction-of-string-telescopes","title":"Engineering, Design and Construction of String Telescopes","description":"\u003cp\u003e\u003cstrong\u003eBy Albert Highe.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e Hardbound, 6 by 9 inches, 440 pages, 285 illustrations and 90 tables. CD not included.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eEngineering, Design and Construction of String Telescopes is Albert Highe’s second book on telescope construction. The first, Engineering, Design and Construction of Portable Newtonian Telescopes (Willmann-Bell) provided an overview of the engineering and materials science fundamentals, and a simplified product development process, applicable to building any telescope. In addition, it supplied quantitative design rules for constructing truss-tube telescopes. Careful testing has proven the validity of the rules, and the creation over the years of more than 30 highly portable telescopes for himself and others has demonstrated the effectiveness of a disciplined approach.\u003cbr\u003e\u003cbr\u003ePortability today is important for almost every deep-sky observer. Seldom do we have a home observatory with dark skies. We must travel to view the night-sky’s splendors. Weight, ease of setup, steadiness and observer comfort become critical in whether the experience is enjoyable and sustainable. Engineering, Design and Construction of Portable Newtonian Telescopes provides that guidance for truss-tube telescopes. However, there remain another class of portable telescopes, “String Telescopes” , that requires a comprehensive volume of its own to provide guidelines, and instruction to create a unique portable instrument with superb performance. Prior to this new book most of that knowledge did not exist. Learn how to\u003cbr\u003e\u003cbr\u003edistinguish between the two classes of string telescope substructures\u003cbr\u003epredict deflections of complete telescope optical assemblies and select the appropriate configuration of struts and guy wires (strings) for your project\u003cbr\u003econstruct, evaluate, and properly tension guy wires made from steel cables or bowstring yarn\u003cbr\u003emeasure and analyse the vibrations of any telescope structure.\u003cbr\u003eBuilding a telescope using flexible structural elements generally is a more ambitious project than one employing only rigid struts. Readers can tackle the project with confidence, knowing that the author has fully explained the underlying science and engineering of string telescopes. The answers to the most probing technical questions can be found here. Yet, little or no technical training is required to build a satisfying instrument. Reader can base their telescope on one of the two successful examples. Their lengthy chapters, profuse with drawings and images, and extensive construction detail, will lead you through the steps required to build an attractive telescope that meets exacting goals.\u003cbr\u003e\u003cbr\u003eSS1\u003cbr\u003eSee what will happen before you build! The interactive Excel spreadsheets help you predict results quickly and easily saving time and money.\u003cbr\u003e\u003cbr\u003ePredict how modifications to those designs, and those of your own creation, will perform with the included easy-to-use Excel® spreadsheets. Similarly, other worksheets allow the quick lay out of optical components and their impact on field illumination, telescope balance, and eyepiece height, and calculate deflection of beams and other structures as a function of size, shape, and load.\u003cbr\u003e\u003cbr\u003eStiffness of four of the more common string telescope configurations, using either polymer guy wires or steel wire ropes.\u003cbr\u003eIllumination profile across telescope and eyepiece fields-of-view (influenced by a comprehensive set of variables).\u003cbr\u003eHorizontal and vertical balance of a telescope optical assembly.\u003cbr\u003eEyepiece height as a function of focuser placement and telescope elevation angle.\u003cbr\u003eDeflection of straight beams with uniform cross section.\u003cbr\u003eAngular deflection of curved beams (simulating altitude bearings).\u003cbr\u003eIn-plane deflection, and out-of-plane deformation, of rings (especially applicable to minimalist upper optical assemblies).\u003cbr\u003eSize and placement of bearing pads to achieve desired forces for altitude and azimuth movement\u003cbr\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765723312280,"sku":"WBSTH","price":40.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/files\/StringTelescopesWEBCombo_1024x1024_2x_8d1864e8-f948-43fe-ae26-3a26ded0b284.jpg?v=1701891386"},{"product_id":"transits","title":"Transits","description":"\u003cp\u003e\u003cstrong\u003eBy Jean Meeus.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 8.50\" by 11.00\", 75 pages, softbound.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eTransits of Venus across face of the Sun rank among the rarest astronomical phenomena — only 81 occur during the 6,000 year period spanning -2000 to +4000.\u003cbr\u003e\u003cbr\u003eThe last transit of Venus took place over 100 years ago (1882) but 2 will occur early in the next century (2004 and 2012).\u003cbr\u003e\u003cbr\u003eTransits of Mercury are somewhat more frequent — 117 occur during the 700 year period +1600 to 2300. Four Mercury transits will take place between 1993 and 2006: 1993, 1999, 2003 and 2006.\u003cbr\u003e\u003cbr\u003eThis book presents elements, geocentric data for all transits of Venus from -2000 to +4000 and Mercury from +1600 to +2300.\u003cbr\u003e\u003cbr\u003eThe elements are based upon the highly accurate planetary theory VSOP87 developed by Bretagnon and Francou at the Bureau des Longitudes of Paris, France.\u003cbr\u003e\u003cbr\u003eThese elements allow the calculation of local circumstances and Jean Meeus has provided all necessary formulae and worked examples to do this. Also presented is a discussion (without elements) of transits seen from other planets.\u003cbr\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765740056728,"sku":"WBTRANS","price":15.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_Transits.jpg?v=1629732124"},{"product_id":"uranometria-2000-0-atlas-deep-sky-field-guide","title":"Uranometria 2000.0 Atlas - Deep Sky Field Guide","description":"\u003cp\u003e\u003cstrong\u003eBy Cragin\/Bonnano.\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e Hardcover.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Deep Sky Field Guide answers these questions:\u003cbr\u003e\u003cbr\u003eJust what kind of galaxy am I looking at?\u003cbr\u003eHow may stars are in that cluster?\u003cbr\u003eWhat is the opacity of that dark nebula?\u003cbr\u003eIs that bright nebula emision or reflective?\u003cbr\u003eand, much, much more.\u003cbr\u003eUranometria 2000.0 Deep Sky Field Guide expands and enhances the Uranometria 2000.0 charts by providing precise data as to location, size, orientation, magnitude, type and much more on non-stellar objects, makin your time out under the stars far more productive.\u003cbr\u003e\u003cbr\u003eSerious observers know that the more they know about an object the better their observing experience. An atlas can give you postion, relative size and possibly a rough idea of its shape but that might not be enough to locate it.\u003cbr\u003e\u003cbr\u003eTake galaxies for example. A galaxy might be quite large but you could have difficulty in locating it if its surface brightness is really dim. Or perhaps is is edge-on— even bright ones like this are sometimes hard to find. To get around these problems we created the Deep Sky Field Guide to Uranometria 2000.0.\u003cbr\u003e\u003cbr\u003eUranometria 2000.0 Deep Sky Field Guide expands and enhances the Uranometria 2000.0 charts by providing precise data as to location, size, orientation, magnitude, type and much more on non-stellar objects, makin your time out under the stars far more productive.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eISBN:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e0-943396-73-5\u003c\/span\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765757620376,"sku":"WBUAD","price":62.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/3-Uranometria-DSFG.jpg?v=1629732300"},{"product_id":"annals-of-the-deep-sky-volume-1","title":"Annals of the Deep Sky Volume 1","description":"\u003cp\u003e\u003cstrong\u003eBy Jeff Kanipe and Dennis Webb\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct information: \u003c\/strong\u003eSoftbound, 6 by 9 inches, 337 pages, first published 2015, black \u0026amp; white.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" data-mce-href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003e\u003cstrong\u003e \u003c\/strong\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e is a comprehensive reference that guides amateur and semipro astronomers into every mind-boggling corner of the observational universe. Each volume presents extensive descriptions of prominent stars and deep-sky objects. No other popular work in astronomy provides the comprehensive historical background and astrophysical appraisals of prominent stars and celestial objects. \u003c\/p\u003e\n\u003cp\u003eAs the kick-off to the Annals series, Volume 1 includes a brief tutorial on basic astronomy and astrophysics before delving into the constellations Andromeda, Antlia, Apus, and Aquarius. The showcase object, of course, is the Andromeda Galaxy (M31) with its enigmatic core, warped disk, and outer star streams. We also profile the spiral galaxy NGC 2997, a showpiece in Antlia, and the jaw-dropping Helix Nebula in Aquarius, the nearest known planetary nebula to Earth. Also included is a brief history of the scientific understanding of planetary nebulae.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003eCheck out other volumes of \u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp class=\"x_MsoNormal\"\u003e\u003cstrong\u003eISBN:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e978-1942675006\u003c\/span\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765774758040,"sku":"WBANN1-1","price":26.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/ADS01.jpg?v=1629732473"},{"product_id":"annals-of-the-deep-sky-volume-2","title":"Annals of the Deep Sky Volume 2","description":"\u003cp\u003e\u003cstrong\u003eBy Jeff Kanipe and Dennis Webb\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e \u003c\/strong\u003e\u003cstrong\u003eProduct information: \u003c\/strong\u003eSoftbound, 6 by 9 inches, 334 pages, first published 2015, black \u0026amp; white.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003e \u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e is a comprehensive reference that guides amateur and semipro astronomers into every mind-boggling corner of the observational universe. Each volume presents extensive descriptions of prominent stars and deep-sky objects. No other popular work in astronomy provides the comprehensive historical background and astrophysical appraisals of prominent stars and celestial objects. \u003c\/p\u003e\n\u003cp\u003e Volume 2 explores the constellations of Aquila, Ara, Aries, Auriga, Boötes, and Caelum, and features a glossary of essential astrophysical terms. Object profiles include the Great Aquila Rift; NGC 6188 and NGC 6193 in Ara, an OB1 association containing “rim nebulae”; the disturbed galaxy NGC 772 (Arp 78) in Aries; the enigmatic star Epsilon Aurigae; NGC 546, a globular cluster with a tidal tail in Boötes; and the “Carafe” group of galaxies with unusual morphologies in Caelum.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003eCheck out other volumes of\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eISBN: \u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e978-1942675013\u003c\/span\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765780787352,"sku":"WBANN2","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/ADS02.jpg?v=1629732563"},{"product_id":"annals-of-the-deep-sky-volume-3","title":"Annals of the Deep Sky Volume 3","description":"\u003cp\u003e\u003cstrong\u003eBy Jeff Kanipe and Dennis Webb\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct information: \u003c\/strong\u003eSoftbound, 6 by 9 inches, 355 pages, first published 2016\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e, black \u0026amp; white\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e is a comprehensive reference that guides amateur and semipro astronomers into every mind-boggling corner of the observational universe. Each volume presents extensive descriptions of prominent stars and deep-sky objects. No other popular work in astronomy provides the comprehensive historical background and astrophysical appraisals of prominent stars and celestial objects. \u003c\/p\u003e\n\u003cp\u003eVolume 3 explores the constellations of Camelopardalis, Cancer, Canes Venatici, and Canis Major, and includes a short history of the search for extrasolar planets. Among other objects Camelopardalis hosts the unusual planetary nebula NGC 1501, a.k.a. the Blue Oyster Nebula. In Cancer we explore the open clusters M44 and M67, as well as the colliding galaxy NGC 2623 (Arp 243). Canes Venatici features the magnificent globular cluster M3 as well as many outstanding galaxies, including a deep review of the Whirlpool Galaxy (M51). In Canis Major we discuss Sirius and its elusive white-dwarf companion, as well as many bright stars clusters and nebulae including the famous Thor’s Helmet (NGC 2359).\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003eCheck out other volumes of\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp class=\"x_MsoNormal\"\u003e\u003cspan\u003e\u003cstrong\u003eISBN: \u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e978-1942675044\u003c\/span\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765783802008,"sku":"WBANN3","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/ADS03.gif?v=1635257493"},{"product_id":"annals-of-the-deep-sky-volume-4","title":"Annals of the Deep Sky Volume 4","description":"\u003cp\u003e\u003cstrong\u003eBy Jeff Kanipe and Dennis Webb\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct information: \u003c\/strong\u003eSoftbound, 6 by 9 inches, 382 pages, first published 2016\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e, black \u0026amp; white\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e is a comprehensive reference that guides amateur and semipro astronomers into every mind-boggling corner of the observational universe. Each volume presents extensive descriptions of prominent stars and deep-sky objects. No other popular work in astronomy provides the comprehensive historical background and astrophysical appraisals of prominent stars and celestial objects. \u003c\/p\u003e\n\u003cp\u003eVolume 4 explores the constellations of Canis Minor, Capricornus, Carina, and Cassiopeia. Featured objects include the first-magnitude star Procyon in Canis Minor, with its shy white dwarf companion nearly hidden in the primary’s glare. Capricornus hosts Dabih, a fascinating quadruple star system, as well as the showcase globular cluster M30, which is almost as old as the universe itself. Carina is home to Eta Carinae, a star of the verge of becoming a supernova, as well as the largest and most active star-forming region in the galaxy, the Carina Nebula (NGC 3372). Cassiopeia features the startling tiple star Iota Cassiopeiae, the massive binary AO Cassiopeiae, and the extensive star-forming region IC 1805, which observers with large telescopes will enjoy exploring time and again.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003eCheck out other volumes of\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp class=\"x_MsoNormal\"\u003e\u003cspan\u003e\u003cstrong\u003eISBN: \u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e978-1942675051\u003c\/span\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765787209880,"sku":"WBANN4","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/3DAnnalsV4.jpg?v=1635257551"},{"product_id":"annals-of-the-deep-sky-volume-5","title":"Annals of the Deep Sky Volume 5","description":"\u003cp\u003e\u003cstrong\u003eBy Jeff Kanipe and Dennis Webb\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct information: \u003c\/strong\u003eSoftbound, 6 by 9 inches, 398 pages, first published 2017\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e, black \u0026amp; white\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e is a comprehensive reference that guides amateur and semipro astronomers into every mind-boggling corner of the observational universe. Each volume presents extensive descriptions of prominent stars and deep-sky objects. No other popular work in astronomy provides the comprehensive historical background and astrophysical appraisals of prominent stars and celestial objects. \u003c\/p\u003e\n\u003cp\u003eVolume 5 explores the constellations of Centaurus, Cepheus, and Cetus. Among other objects Centaurus features a detailed overview of the Alpha Centauri system, the Scorpius-Centaurus Association, and the stunning Omega Centauri globular cluster (NGC 5139). Cepheus hosts the star-forming region IC 1396 and several fine star clusters, some still associated with nebulosity. Cetus leads us into a large extragalactic realm where we find the nearby dwarf irregular IC 1613, the edge-on spiral NGC 1055, and one of the brightest and nearest Seyfert 2 galaxies, M77.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003eCheck out other volumes of\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp class=\"x_MsoNormal\"\u003e\u003cstrong\u003eISBN: \u003c\/strong\u003e978-1942675099\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765789831320,"sku":"WBANN5","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/Annals-5-3D-Cover.gif?v=1635257602"},{"product_id":"annals-of-the-deep-sky-volume-6","title":"Annals of the Deep Sky Volume 6","description":"\u003cp\u003e\u003cstrong\u003eBy Jeff Kanipe and Dennis Webb\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct information: \u003c\/strong\u003eSoftbound, 6 by 9 inches, 318 pages, first published 2018\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e, black \u0026amp; white\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e is a comprehensive reference that guides amateur and semipro astronomers into every mind-boggling corner of the observational universe. Each volume presents extensive descriptions of prominent stars and deep-sky objects. No other popular work in astronomy provides the comprehensive historical background and astrophysical appraisals of prominent stars and celestial objects.  \u003c\/p\u003e\n\u003cp\u003eVolume 6 explores the constellations of Chamaeleon, Circinus, Columba, Coma Berenices, and Corona Australis. Among the many objects profiled, Chamaeleon features a molecular cloud complex that occupies most of its central and eastern regions, as well as the Epsilon Chamaeleontis stellar association. Circinus, too, hosts a molecular cloud worthy of imagers’ focus, as well as a planetary nebula with an intriguing structure (NGC 5315) and ESO 97-13, the nearest Seyfert galaxy to the Milky Way. Further north in Columba we visit the runaway star of Mu Columbae as well as NGC 1851, a compact globular cluster that is a possible remnant of a dwarf galaxy. Coma Berenices is best known for its host of galaxies such as the Black Eye Galaxy M64, the edge-on spiral NGC 4565, and the interacting system known as the Mice (NGC 4676) — but it also hosts fascinating stars like the multiple system 35 Comae Berenices and the flip-flopping FK Comae Berenices. And in Corona Australis we encounter yet another molecular cloud, the very old globular cluster NGC 6541, and the binary galactic system NGC 6768.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003eCheck out other volumes of\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\"\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"x_MsoNormal\"\u003e\u003cspan\u003e\u003cstrong\u003eISBN:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e978-1942675112\u003c\/span\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765793435800,"sku":"WBANN6","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/Annals-3D-Cover.jpg?v=1635257630"},{"product_id":"annals-of-the-deep-sky-volume-7","title":"Annals of the Deep Sky Volume 7","description":"\u003cp\u003e\u003cstrong\u003eBy Jeff Kanipe\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct information: \u003c\/strong\u003eSoftbound, 6 by 9 inches, 398 pages, first published 2019\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e, black \u0026amp; white\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e is a comprehensive reference that guides amateur and semipro astronomers into every mind-boggling corner of the observational universe. Each volume presents extensive descriptions of prominent stars and deep-sky objects. No other popular work in astronomy provides the comprehensive historical background and astrophysical appraisals of prominent stars and celestial objects. \u003c\/p\u003e\n\u003cp\u003eVolume 7 explores the constellations of Corona Borealis, Corvus, Crater, and Crux. Featured objects include the enigmatic variable star R Coronae Borealis; the dusty face-on spiral galaxy NGC 5958 in Corona Borealis; the spectacular young merging galactic system NGC 4038 and NGC 4039 (the Antennae Galaxies) in Corvus; the Crater Cluster; and the Jewel Box (NGC 4755) and Coalsack Nebula in Crux. Also included is an extensive appendix on the life and work of William and Caroline Herschel.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003eCheck out other volumes of\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"x_MsoNormal\"\u003e\u003cspan\u003e\u003cstrong\u003eISBN: \u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e978-1942675136\u003c\/span\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765798088856,"sku":"WBANN7","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/Annals-of-the-Deep-Sky-Volume-7.jpg?v=1635257668"},{"product_id":"annals-of-the-deep-sky-volume-8","title":"Annals of the Deep Sky Volume 8","description":"\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eBy Jeff Kanipe\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct information: \u003c\/strong\u003eSoftbound, 6 by 9 inches, 416 pages, first published 2020, color.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e is a comprehensive reference that guides amateur and semipro astronomers into every mind-boggling corner of the observational universe. Each volume presents extensive descriptions of prominent stars and deep-sky objects. No other popular work in astronomy provides the comprehensive historical background and astrophysical appraisals of prominent stars and celestial objects. \u003c\/p\u003e\n\u003cp\u003eVolume 8 explores the constellations of Cygnus, Delphinus, and Dorado. Cygnus is extremely rich, particularly in nebulae. Featured objects include popular favorites such as Chi Cygni, which has one of the largest visual amplitudes among Mira-class stars; P Cygni, a supernova in the making; the North America and Pelican nebulae; NGC 6888, the Crescent Nebula; and the radio galaxy Cygnus A. Featured objects in Delphinus include the “slow” nova HR Delphini; the bright globular clusters NGC 6394 and NGC 7006; and the galaxy groups of NGC 6928 and NGC 6956. Finally, Dorado leads us into the wonders of the southern sky including the close binary Alpha Doradus; R Doradus, known for having the largest apparent diameter of any star except the Sun; and the beautiful face-on spiral galaxy NGC 1566.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/shopatsky.com\/collections\/annals-of-the-deep-sky\" target=\"_blank\"\u003eCheck out other volumes of\u003cspan\u003e \u003c\/span\u003e\u003cem\u003eAnnals of the Deep Sky\u003c\/em\u003e\u003c\/a\u003e.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765800906904,"sku":"WBANN8","price":34.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/annals-v8psd3.jpg?v=1635454309"},{"product_id":"astronomical-algorithms-2nd-edition","title":"Astronomical Algorithms, 2nd Edition","description":"\u003cp\u003e\u003cstrong\u003eBy Jean Meeus\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 6.00\" by 9.00\", 477 pages, hardbound, 2nd Edition published 1999.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAbout the book \u003cem\u003eAstronomical Algorithms\u003c\/em\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eIn the field of celestial calculations, Jean Meeus has enjoyed wide acclaim and respect since long before microcomputers and pocket calculators appeared on the market. When he brought out his Astronomical Formulae for Calculators in 1979, it was practically the only book of its genre. It quickly became the \"source among sources,\" even for other writers in the field. Many of them have warmly acknowledged their debt (or should have), citing the unparalleled clarity of his instructions and the rigor of his methods.\u003cbr\u003e\u003cbr\u003eAnd now this Belgian astronomer has outdone himself yet again with \u003cem\u003eAstronomical Algorithms\u003c\/em\u003e! Virtually every previous handbook on celestial calculations (including his own earlier work) was forced to rely on formulae for the Sun, Moon, and planets that were developed in the last century — or at least before 1920. The past 10 years, however, have seen a stunning revolution in how the world's major observatories produce their almanacs. The Jet Propulsion Laboratory in California and the U.S. Naval Observatory in Washington, D.C., have perfected powerful new machine methods for modeling the motions and interactions of bodies within the solar system. At the same time in Paris, the Bureau des Longitudes has been a beehive of activity aimed at describing these motions analytically, in the form of explicit equations.\u003cbr\u003e\u003cbr\u003eYet until now the fruits of this exciting work have remained mostly out of reach of ordinary people. The details have existed mainly on reels of magnetic tape in a form comprehensible only to the largest brains, human or electronic. But \u003cem\u003eAstronomical Algorithms\u003c\/em\u003e changes all that. With his special knack for computations of all sorts, the author has made the essentials of these modern techniques available to us all.\u003cbr\u003e\u003cbr\u003eThe second edition contains new chapters about the Jewish and Moslem Calendars, and on the satellites of Saturn, and a new Appendix giving expressions (polynomials) for the heliocentric coordinates of the giant planets Jupiter to Neptune from 1998 to 2025.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eISBN:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e978-0943396613\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765803823256,"sku":"WBAA2","price":35.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_AstroAlgo.jpg?v=1629732897"},{"product_id":"binocular-astronomy-2nd-edition","title":"Binocular Astronomy, 2nd Edition","description":"\u003cp\u003e\u003cstrong\u003eBy Craig Crossen and Wil Tirion.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 8.5\" by 11.00\", 224 pages, hardbound, published 2008.\u003c\/p\u003e\n\u003cp\u003eBinocular Astronomy and a pair of binoculars are all you need to begin observing the night sky — stars, open and globular clusters, bright and dark nebulae, galaxies, and much more. The binoculars need not be expensive! The majority of the objects described in this book were viewed by the author using a pair of $40 binoculars he purchased from Sears \u0026amp; Roebuck in 1978. The chances are good that you now have or can borrow a pair of binoculars that will do very nicely.\u003cbr\u003e\u003cbr\u003eFor this edition, Craig Crossen has added descriptions and discussions of a large number of objects visible only in “ giant ” and “ supergiant ” binoculars (glasses of the 11 x 80, 20 x 70, or 15 x 110 range). Thus this book should be useful even to owners of small richest-field telescopes.\u003cbr\u003e\u003cbr\u003eYou don ' t have to buy an atlas. Binocular Astronomy includes Wil Tirion ' s 10-map The Bright Star Atlas 2000.0. This atlas plots practically every star visible with the naked eye plus hundreds of deep-sky objects. Tirion has also created 31 detailed finder charts, two of which are double-page spreads, plus a set of seasonal finder charts. Also included are 25 photographs (most are wide field) and 40 Tables.\u003cbr\u003e\u003cbr\u003eNot only does Binocular Astronomy help you locate objects but it explains what they are and how they fit into our understanding of the universe. While there is great aesthetic beauty in the night sky, there is also the Science of Astronomy. You can easily skip over the technical jargon, but you will probably soon find yourself recognizing a star ' s age by its color, understanding its place in our Galaxy by its distance and much else.\u003cbr\u003e\u003cbr\u003eBinocular Astronomy will show you why most experienced amateur astronomers think that binoculars should be the first optical instrument for the beginner and why they are of value to even seasoned observers.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765852352664,"sku":"WBBA","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_BinocAstro.jpg?v=1629733476"},{"product_id":"build-your-own-telescope-3rd-ed","title":"Build Your Own Telescope, 3rd Ed.","description":"\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003eBuild Your Own Telescope: Complete Plans for Five Telescopes You Can Build With Simple Hand Tools, Third Edition\u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e \u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003eAuthor: \u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003eRichard Berry\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003eFor anyone who has ever dreamed of exploring the heavens with a telescope, \u003ci\u003eBuild Your Own Telescope\u003c\/i\u003e can make that dream come true! Richard Berry provides clear, step-by-step instructions on constructing a powerful telescope—from a simple reflector suitable for a parent and child to build together to a 10-inch \"research-grade\" telescope capable of sustaining a lifetime interest in astronomy—all with ordinary household tools and materials. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 8.0pt; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003eThe book provides complete plans and 275 illustrations for these five telescopes:\u003cspan style=\"mso-tab-count: 1;\"\u003e    \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; mso-add-space: auto; text-indent: -.25in; line-height: 115%; mso-list: l0 level1 lfo1;\" class=\"MsoListParagraphCxSpFirst\"\u003e\u003c!-- [if !supportLists]--\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; mso-ascii-font-family: Aptos; mso-fareast-font-family: Aptos; mso-hansi-font-family: Aptos; mso-bidi-font-family: Aptos;\"\u003e\u003cspan style=\"mso-list: Ignore;\"\u003e•\u003cspan style=\"font: 7.0pt 'Times New Roman';\"\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e4\" f \/10 Reflector:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e A sturdy and easy-to-use telescope perfect for beginners or as a parent\/child project.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; mso-add-space: auto; text-indent: -.25in; line-height: 115%; mso-list: l0 level1 lfo1;\" class=\"MsoListParagraphCxSpMiddle\"\u003e\u003c!-- [if !supportLists]--\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; mso-ascii-font-family: Aptos; mso-fareast-font-family: Aptos; mso-hansi-font-family: Aptos; mso-bidi-font-family: Aptos;\"\u003e\u003cspan style=\"mso-list: Ignore;\"\u003e•\u003cspan style=\"font: 7.0pt 'Times New Roman';\"\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e6\" f \/8 Dobsonian Reflector:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e A light, compact telescope that is simple to build, but powerful enough to satisfy a backyard observer for many years.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; mso-add-space: auto; text-indent: -.25in; line-height: 115%; mso-list: l0 level1 lfo1;\" class=\"MsoListParagraphCxSpMiddle\"\u003e\u003c!-- [if !supportLists]--\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; mso-ascii-font-family: Aptos; mso-fareast-font-family: Aptos; mso-hansi-font-family: Aptos; mso-bidi-font-family: Aptos;\"\u003e\u003cspan style=\"mso-list: Ignore;\"\u003e•\u003cspan style=\"font: 7.0pt 'Times New Roman';\"\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e6\" f \/8 Equatorial Reflector:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e A classic design for the amateur astronomer or crafter who wants an elegant telescope and great performance. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; mso-add-space: auto; text-indent: -.25in; line-height: 115%; mso-list: l0 level1 lfo1;\" class=\"MsoListParagraphCxSpMiddle\"\u003e\u003c!-- [if !supportLists]--\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; mso-ascii-font-family: Aptos; mso-fareast-font-family: Aptos; mso-hansi-font-family: Aptos; mso-bidi-font-family: Aptos;\"\u003e\u003cspan style=\"mso-list: Ignore;\"\u003e•\u003cspan style=\"font: 7.0pt 'Times New Roman';\"\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e10\" f \/6 Dobsonian Reflector:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e A powerful and versatile telescope suitable for casual stargazing or serious amateur long-term observing programs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; mso-add-space: auto; text-indent: -.25in; line-height: 115%; mso-list: l0 level1 lfo1;\" class=\"MsoListParagraphCxSpLast\"\u003e\u003c!-- [if !supportLists]--\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; mso-ascii-font-family: Aptos; mso-fareast-font-family: Aptos; mso-hansi-font-family: Aptos; mso-bidi-font-family: Aptos;\"\u003e\u003cspan style=\"mso-list: Ignore;\"\u003e•\u003cspan style=\"font: 7.0pt 'Times New Roman';\"\u003e         \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c!--[endif]--\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e6\" f \/15 Refractor:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e A large refractor that outperforms commercial telescopes of considerably larger apertures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e \u003c\/span\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003eFormat:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e Hardcover\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003eSize: \u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e8.5 x 11”\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003ePages: \u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e287\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003eISBN: \u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e9780943396699\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"margin-bottom: 0in; margin-top: 0in; mso-margin-bottom-alt: 8.0pt; mso-margin-top-alt: 0in; mso-add-space: auto; line-height: 115%;\" class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003ePublication Date: \u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; line-height: 115%; font-family: 'Univers',sans-serif;\"\u003e2000\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765860937880,"sku":"WBBYOT","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/files\/Build_Your_Own_Telescope_3E_Cover.jpg?v=1746713212"},{"product_id":"dobsonian-telescope","title":"The Dobsonian Telescope","description":"\u003cp\u003e\u003cstrong\u003eBy David Kriege and Richard Berry\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 6\" by 9\" inches, 496 pages, hardbound, 179 pictures, 88 drawings and 34 tables.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAbout this book:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e The \u003cem\u003eDobsonian Telescope, A Practical Manual for Building Large Aperture Telescopes\u003c\/em\u003e tells how you can build a state-of-the-art Dobsonian telescope using readily available materials and supplies. Every step of construction is detailed in photographs and diagrams, and the underlying ideas are carefully explained. As a result of this three-year collaboration between authors David Kriege and Richard Berry, experienced and well-known telescope makers, you now have the opportunity to build a high-performance telescope from 14 inches to 40 inches aperture based on the thoroughly tested designs described in this book.\u003cbr\u003e\u003cbr\u003e The Dobsonian telescope takes its name from the astronomer\/philosopher John Dobson, who introduced the concept of inexpensive, large-aperture telescopes to astronomy. Amateur astronomers at the time were so amazed that a telescope built from simple, inexpensive materials performed so well that they could hardly believe their eyes. As home-built Dobsonians started showing up at star parties across the nation and people saw what Dobsonians could do, the word spread. In just a few years, the Dobsonian revolution swept the world.\u003cbr\u003e\u003cbr\u003e Since those early telescopes, Dobsonians have improved dramatically. An entire generation of amateur telescope makers contributed their best insights and refinements to Dobson's original design. Today's Dobsonians are larger, lighter, and more precise than ever before. For example, it is possible to build a telescope of 20 inches aperture that is compact enough to transport in a hatchback automobile, yet takes only ten minutes to set up at a remote, dark-sky observing site.\u003cbr\u003e\u003cbr\u003e Deep-sky observers especially appreciate Dobsonian telescopes. With the 20-inch (50 centimeter) aperture that the authors recommend for first-time Dobsonian builders, hundreds of globular clusters, thousands of nebulae, and tens of thousands of galaxies are visible through the eyepiece. Planetary observers have discovered that from good observing sites, Dobsonians deliver breathtaking performance on the moon and planets. For the casual stargazer, familiar objects like the Hercules Cluster, the Great Nebula in Orion, the Lagoon Nebula, and the galaxies of the Virgo Cluster are an entirely new experience.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eHere are some of the topics covered in this book:\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli\u003eDeciding what size telescope will suit your needs\u003c\/li\u003e\n\u003cli\u003eOrdering optics for a large Dobsonian\u003c\/li\u003e\n\u003cli\u003eUnderstanding plywood and how to use it properly\u003c\/li\u003e\n\u003cli\u003eMaking a flotation cell to support the primary mirror\u003c\/li\u003e\n\u003cli\u003eFiguring how long to cut the poles for the truss tube\u003c\/li\u003e\n\u003cli\u003eConstructing precision truss tube sockets\u003c\/li\u003e\n\u003cli\u003ePerforming torque analysis for first-time balance\u003c\/li\u003e\n\u003cli\u003eInstalling precision digital setting circles\u003c\/li\u003e\n\u003cli\u003eSetting up and taking down the telescope\u003c\/li\u003e\n\u003cli\u003eHow to collimate your optics correctly\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhether you have never observed before or whether you have been an amateur astronomer all your life, you will benefit from the hands-on familiarity and experience in amateur astronomy and telescope making that the authors bring to this book.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eISBN:\u003c\/strong\u003e 978-0943396552\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40765870178456,"sku":"WBDT","price":30.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_DobTel.jpg?v=1629733622"},{"product_id":"fundamental-ephemeris-computations","title":"Fundamental Ephemeris Computations","description":"\u003cp\u003e\u003cstrong\u003eBy Paul J. Heafner.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 332 Pages, Hardbound, 6 by 9 inches. Iincludes CD.\u003c\/p\u003e\n\u003cp\u003eWithin the last decade there have been many books dealing with the application of personal computers to general problems in celestial mechanics. So, the reader may ask, Why one more? The most evident reason is the use of approximations. Usually a full verbal explanation of a procedure is given, but when the algorithm is programmed, approximations are often made that, in the final analysis, defeat the power of a computer. Modern microcomputers are wonderful machines, never tiring of performing the same computations over and over again until the user is satisfied with the result. While it is true that efficient coding often reduces the execution time, the point is that there is no need to make any great approximations until the very end of the computation. For instance, it is generally accepted that it is useless to compute times of sunrise and sunset to an accuracy greater than one minute of time because of the uncertain nature of atmospheric refraction near the horizon and the constantly changing local meteorological conditions. However, why not let the computer perform the computation to the full precision of the machine and then let the user round the result to the nearest minute of time?\u003cbr\u003e\u003cbr\u003eAnother major problem with existing computer-oriented astronomical books is that there has been little or no effort to adopt the computational algorithms used for the preparation of data in the national almanacs, particularly the U.S. Naval Observatorys Astronomical Almanac. So the primary goal of this book is to present a library of useful PowerBASIC and C subprograms and functions that can be combined to make powerful application programs. These routines cover both elementary and advanced topics in computational celestial mechanics and spherical astronomy such as time systems, precession, nutation, coordinate transformations, orbital elements and ephemerides, reduction to apparent place, rise\/transit\/set times for celestial objects, and use of the JPL ephemerides. Care has been taken to present the results of computations in the same form as the corresponding data in the Astronomical Almanac and at least to the same precision. This book is the only one describing how to obtain, process, and use the official Jet Propulsion Laboratory ephemeris data files. The JPL ephemerides form the basis of practically all of the national astronomical almanacs, including the Astronomical Almanac. Many readers will be surprised to learn that these data files are available free from JPL via the Internet or via a CD-ROM prepared by JPL and published by Willmann-Bell ( $24.95 plus $1.00 shipping). See sidebar for details about the JPL CD-ROM. In this book the author gives explicit instructions on how to retrieve them from JPL and put them into a usable form. In addition, with this book comes a disk that includes enhanced PowerBASIC and C versions of the original JPL FORTRAN processing software that manipulates the data files. Today, these ephemerides are considered to be the final word on planetary ephemerides, and now the serious non-professional who wants to make use of them can do so.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40766474748056,"sku":"WBFEC","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/files\/bk_FundEphem_1024x1024_2x_fef285cd-0a03-4ebc-9993-b0e2bec908e4.jpg?v=1701891306"},{"product_id":"handbook-of-astronomical-image-processing-2nd-ed","title":"Handbook of Astronomical Image Processing, 2nd Ed.","description":"\u003cp class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003eAuthors:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e Richard Berry and James Burnell\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003eIn this second edition of \u003ci\u003eThe Handbook of Astronomical Image Processing\u003c\/i\u003e, Richard Berry and James Burnell address many important changes that have taken place in astronomical imaging since the publication of the first edition. Today's affordable astro-imaging capable digital single-lens-reflex cameras (DSLRs), the growing power of personal computers, and the proliferation of telescopes and imaging accessories has brought imaging capabilities within the reach of practically every amateur astronomer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003eThe original chapters on astronomical equipment and imaging techniques were amplified, discussions on astrometry and photometry were revised to reflect the steady growth in these scientific fields, and tutorials in the back of the book have been expanded to help you get up to speed quickly.\u003c\/span\u003e\u003cspan style=\"font-size: 10.5pt; font-family: 'Arial',sans-serif; color: #0f1111; background: white;\"\u003e \u003c\/span\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003eAlso new are comprehensive chapters on color imaging with astronomical CCD cameras and processing color images from digital cameras, and photon-counting fundamentals every serious astro-imager needs to know.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003eIMPORTANT\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e:\u003cb\u003e \u003c\/b\u003eAAS no longer supplies the CD for this title. The most current version of the AIP4WIN software can be accessed for free through an online group created and maintained by coauthor, Richard Berry. Join the group here: \u003ca href=\"mailto:aip4win@groups.io\"\u003eaip4win@groups.io\u003c\/a\u003e for download instructions. Please note that AAS has no affiliation with the AIP4WIN group. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003eFormat:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e Paperback\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003eSize:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e 6 x 9\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003eISBN:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e 9781942675082\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003ePublication Date:\u003c\/span\u003e\u003c\/b\u003e\u003cspan style=\"font-size: 11.0pt; font-family: 'Univers Light',sans-serif;\"\u003e 2005\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40766480154776,"sku":"WBHAIP2","price":90.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/files\/51LVphDgwVL._SY445_SX342_ControlCacheEqualizer.jpg?v=1753463432"},{"product_id":"how-to-make-a-telescope-2nd-ed","title":"How to Make a Telescope, Second Edition","description":"\u003cp\u003e\u003cstrong\u003eAuthor: \u003c\/strong\u003eJean Texereau\u003c\/p\u003e\n\u003cp\u003eThe first edition of \u003cem\u003eHow to Make a Telescope\u003c\/em\u003e was universally acclaimed as the best book ever written for making a Newtonian telescope. This second edition has been expanded, providing new chapters on making a Cassegrainian telescope, optical window, equatorial mount, and computer programs written in generic BASIC for the reduction of Foucault test data.\u003c\/p\u003e\n\u003cp\u003eAdditionally, it includes comprehensive bibliographies from \u003cem\u003eAmateur Telescope Making Journal\u003c\/em\u003e, \u003cem\u003eSky \u0026amp; Telescope's\u003c\/em\u003e \"Gleanings for ATMs,\" \u003cem\u003eScientific American\u003c\/em\u003e, and \u003cem\u003eTelescope Making\u003c\/em\u003e. This book is the most complete single work available on making reflecting telescopes!\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eFormat:\u003c\/b\u003e Hardcover\u003cbr\u003e\u003cb\u003eSize:\u003c\/b\u003e 6 x 9 inches\u003cbr\u003e\u003cb\u003ePages:\u003c\/b\u003e 440\u003cbr\u003e\u003cb\u003eISBN: \u003c\/b\u003e9780943396040\u003cbr\u003e\u003cb\u003ePublication Date:\u003c\/b\u003e 1984\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40766495359128,"sku":"HOWMATE2","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_How2Make.jpg?v=1629739942"},{"product_id":"interferometry-for-amateur-telescope-makers-cdrom","title":"Interferometry for Amateur Telescope Makers","description":"\u003cp\u003eInterferometry for Amateur Telescope Makers, A practical guide to building verifying and using an optical interferometer including powerful software to evalute interferograms\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBy William Zmek.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e 6 by 9 inches, hardbound, 500 pages, 38 photographs, 195 drawings. CD is included.\u003c\/p\u003e\n\u003cp\u003eThis book has been written for the Amateur Telescope Maker (ATM) one who grinds, polishes, figures and tests optical surfaces with the objective of achieving near perfection and desires a practical guide to testing and interpreting full-aperture optical interferogram using a homebuilt interferometer. To that end, I start with a review of optical interference, after which I provide a systematic approach on how the ATM can build an optical interferometer without any input other than this book and homemade, surplus or common off-the-shelf components. For the Williams interferometer the experienced telescope maker is likely to have accumulated a well-stocked ???Junquebox??? that could be a significant component source. However, the main components if purchased today (Summer 2017) cost less than $300: He-Ne Laser $69.95 and power supply $11.95, 30mm cube beam splitter $39.95, GRIN lens $47.50 or 8.0mm ball lens $29.95, reference optic $26.00, Webcam $25.00 and auxiliary webcam lens $49.50. See Appendix D or a list of suppliers. This book describes how to make mounting hardware for little more than the time and effort it takes to build them but if purchased new or even used these would be a significant additional expense.\u003cbr\u003e\u003cbr\u003eThe accuracy of the interferometer can be easily confirmed using a spherical mirror that has been validated by a go\/no-go Foucault knife-edge (KE) null test. Spherical mirrors are relatively easy for the ATM to make and null test to a high level of accuracy. In Section 1.4 I note that the accuracy of a concave sphere that appears uniform and velvety smooth in the Foucault null test can be assumed to approach a smooth 1\/40 wave peak-to-valley surface. And in Section 4.2.1.1 it is observed that a four-inch diameter sphere of sixteen inch radius will allow verification of mirrors as fast as f\/2 at infinity focus. This test sphere need not be aluminized. In fact it is normally better that it is not. To close out the book, I offer some words on how to fold the rating of the objective mirror into a more complete perspective on the performance of a finished telescope.\u003cbr\u003e\u003cbr\u003eThe fringe following software offered with this book comes in two parts, a stand-alone executable named FRINGE_DAT, and an Excel 2003 spreadsheet program named RED_FRINGE. The former collects fringe center data from an interferogram, and the latter processes that data into information about the tested mirror. The program is designed to make the data processing and analysis relatively easy and quick and provides features that allow whole system assessment by inclusion of secondary mirror error and on-axis eyepiece primary spherical aberration.\u003cbr\u003eThe choice to program in Excel ??? which was made so that the formulas and computations could be accessed by the interested user ??? was perhaps a bit risky, in that many readers will not own a copy, and also because software applications like Excel suffer periodic alterations by their suppliers, thereby making the specifics of menu trees and procedural details provided in this book prone to obsolescence. However, because the capabilities offered in applications such as Excel are usually simply added upon rather than replaced with different capabilities, the user of RED_FRINGE having a later release of Excel than the 2003 version will only need to search within the menus for the new location of any particular tool or widget mentioned in Chapter 13. The software should still work fine. \u003cbr\u003e\u003cbr\u003eTwo types of interferometers are discussed in detail: The Williams and Bath. My homemade Williams, in combination with the data reduction software that accompanies this book, produced test results for a particular six-inch diameter f\/8 mirror that are near-identical to that found by a state-of-the-art heterodyne interferometer with its sophisticated software (see Appendix C). Also included with this book are the digital images used to measure the mirror so that readers can ???reduce data??? even before they have constructed their own interferometer.\u003cbr\u003e\u003cbr\u003eThe advantages of a carefully executed, full-aperture interferometry test is that it provides a densely sampled measurement of every possible significant form of optical error. On the other hand, the ATMs standby tool, the knife-edge test provides only partial visibility into the mirror???s full surface figure. The use of ???no- mask??? digital image KE tests avoid the accuracy-degrading effects of diffraction that accompanies the visual Couder mask test, by eliminating the vagaries of shadow cutoff estimation (except at the very edge of a tested mirror). These tests also replace the subjective estimate of Foucault shadow depths with true measurements based on the modern silicon detector array such as the CCD. Even so, this form of the test only measures axisymmetric components of the surface error, and still only measures across a single diameter of the tested mirror. Interferometry can easily assess all forms of error in an optic, and does so across the entire surface, not just a single diameter. The knife-edge mask test always under-reports the departure of the actual surface from the ideal surface. In other words, the knife-edge test overstates the actual surface accuracy. Normally this departure is not significant for smooth, slower, moderate aperture mirrors. However, for thinner, faster and larger mirrors the differences can be significant. For a variety of reasons the trend in telescope construction today is toward much faster, larger thin-mirror telescopes.\u003cbr\u003e\u003cbr\u003eThe careful reader will perhaps wonder if the in-depth error analysis provided in Section 13.4.1.1 implies that interferometry is more sensitive to set-up tolerances and mirror geometry measurement tolerances than the Foucault-Couder Mask test. Not at all ??? those same sensitivities apply exactly to the Foucault mask test. Tolerance error in the measurement of the mirror ROC and diameter apply equally to both tests. For more information, consult Section 13.4.3.2 for similarities and differences between the Foucault result and interferometric results.\u003cbr\u003e\u003cbr\u003eAlmost every ATM is familiar with the extreme accuracy capabilities of an optical laser interferometer but most never attempt to unleash its power in their shop because it is seen as difficult to construct and master in use. The repeatability of an interferometric measurement as shown in this book is generally commensurate with that of a well-executed Foucault mask test. Interferometry can claim much higher accuracy than the K-E test due to its ability to sense the entire surface of a tested mirror in a single image, and in its ability to sense all of the error present in that surface. Recall that the K-E test cannot. This reality is covered in detail in the earlier pages of this book. The purpose of this book is to demonstrate how any careful worker???a characteristic of every serious ATM???can master and exploit the power of optical interferometry.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40766504075416,"sku":"WBIATM","price":40.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/InterferometryWP.gif?v=1629740066"},{"product_id":"introduction-to-lens-design","title":"Introduction to Lens Design","description":"\u003cp\u003e\u003cstrong\u003eBy Joseph M. 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Although it is about lens design, the scope is general and will provide optical engineers and others with important tools and skills useful in a world which increasingly relies on optics in a wide variety of applications.\u003cbr\u003e\u003cbr\u003eThe book’s theme generally follows the historic development of the photographic lens. Ten photographic lens design problems are presented from the simple Wollaston landscape lens to the more complex achromatic telephoto. This book recognizes the fact that a modern lens design must thoroughly integrate one of the commercially available lens design codes into its presentation. While ZEMAX examples are used here, other software is not precluded. Manual (pencil and paper) thin lens pre-design calculations provide the starting prescriptions for every ZEMAX illustrated problem. Paraxial ray tracing, element power computations, and aberration calculations are utilized throughout. Consequently, all designs are firmly anchored by theory.\u003cbr\u003e\u003cbr\u003eThe design principles covered in the book include: lens bending, stop shift, symmetry, element splitting, color correction, aberration balancing, field flattening, and aspherics, as well as the proper use and construction of the merit function. Of equal importance are the analytical tools used to determine the quality of the design. Today, all modern codes are built upon a strong tradition of optical analysis. They can provide the user with a rich variety of numbers and plots (such as axial color and ray fan plots, spot diagrams, and MTF). 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Several hundred photographs and line drawings of exceptional quality compliment the clearly written text. Unlike deep-sky observing, meaningful observations can be made in your own backyard. One of the authors of this book, Donald Parker, routinely takes pictures from his home in Coral Gables, Florida which have been favorably compared to those taken at professional observatories under the best sky conditions.\u003c\/p\u003e","brand":"ShopAtSky.Com","offers":[{"title":"Default Title","offer_id":40766513250456,"sku":"WBIOPSS","price":25.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0575\/4408\/1560\/products\/bk_ObsPhoSolar.jpg?v=1629740205"},{"product_id":"introduction-to-webcam-astrophotography","title":"Introduction to Webcam Astrophotography","description":"\u003cp\u003e\u003cstrong\u003eBy Robert Reeves.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Information:\u003c\/strong\u003e Hardbound, 6 by 9-inches, 368 pages, 156 illustrations and 21 tables.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eIn the last few years webcam astrophotography has exploded onto the astronomy scene. It has rapidly evolved from short exposure six-bit black-and-white imagery into long-exposure full-color 16-bit per channel imagery of such quality that it rivals “conventional” means of astrophotography. Indeed, webcams have become the method of choice for planetary imaging.\u003cbr\u003e\u003cbr\u003eThe message of this book is that you too can participate in the digital astrophotography revolution without spending very much money. You do not need to invest $10,000 in a CCD camera, telescope and software. A basic webcam costs about the same as a \"\"so-so\"\" eyepiece. Software to control the camera and process the images that will get you going is free. If you have the telescope (practically any telescope that will track) and a computer you are ready. Since you see your results instantly the learning curve is much shorter.\u003cbr\u003e\u003cbr\u003eRegardless of how you apply a webcam to astrophotography, you will derive a number of benefits. 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Each were updated versions of articles written at different times and for several different European and Canadian journals, principally Heelal, the monthly journal of the Belgian Dutch-language astronomical society ‘Vereniging voor Sterrenkunde’ (VVS).\u003cbr\u003e\u003cbr\u003eFive years later (2002) More Mathematical Astronomical Morsels appeared with 75 chapters divided into six categories: The Moon, Eclipses and Occultations, Planetary Motions, Planetary Phenomena, On the Celestial Sphere and Varia.\u003cbr\u003e\u003cbr\u003eTwo years later (2004) Mathematical Astronomy Morsels III was published with 57 chapters divided into six categories: The Moon, Eclipses, Planetary Motions, Planetary Phenomena, On the Celestial Sphere and Varia.\u003cbr\u003e\u003cbr\u003eThree years later (2007) Mathematical Astronomy Morsels IV appeared and Jean Meeus wrote “To our surprise, there are still more interesting subjects in the field of mathematical astronomy, whence this fourth collection of Morsels.” Morsels IV contains 68 chapters divided into six categories: The Moon, Eclipses, Occultations, Planetary Motions, Planetary Phenomena and Varia.\u003cbr\u003e\u003cbr\u003eAnd now, just two years later (2009) Mathematical Astronomy Morsels V! 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