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Skyglobe is an astronomy program for DOS and Microsoft Windows first developed in the late 1980s and early 1990s, and originally sold as Shareware〔(Skyglobe download page on archive.org )〕 but now available as closed-source freeware.〔(Sidewalk Astronomy's Skyglobe download page on Internet Archive )〕 It plots the positions of stars, Messier objects, planets, sun and moon. Skyglobe was designed by Mark A. Haney and his company KlassM Software Inc. in Ann Arbor, Michigan, and first released in 1989, after Mark graduated in computer science from Michigan State University. Use of Skyglobe is still suggested to students at Villanova University.〔(Villanova University Skyglobe page )〕 Registered users of the DOS version received additional software, such as a Skyglobe screensaver, and Crystal Sphere, an application simulating the 3,800 stars nearest the solar system. Crystal Sphere may have been the progenitor of CircumSpace, KlassM Software's subsequent stellar neighborhood simulator, displaying the nearest 7,780 stars. At least two versions of Skyglobe were later released for Microsoft Windows, being variously listed as versions 1.0, 2.0, 2.02 and 4.0, as well as other possible iterations between. Skyglobe for Windows (also known as SG4WIN) is freely available online. == Accuracy == Skyglobe accounts for the earth's precession in its calculations and should therefore be accurate to tens of thousands of years in the past and the future, but its manual does warn that the positions of planets might not be accurate throughout this range (it says "their coordinates are approximately correct for as far back and forward as we have data").〔(Skyglobe manual )〕 Skyglobe's dates use the Julian calendar until October 4, 1582 and the Gregorian calendar thereafter. It does not have a zero year. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Skyglobe」の詳細全文を読む スポンサード リンク
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