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== Sources == {{Refbegin}} * Alsted, Johann Heinrich 1649 [1630]. [https://archive.org/stream/ioanhenricialste234alst#page/122/mode/2up ''Encyclopaedia''] {{in lang|la}}, Tome '''4''', Page 122. * [https://catalog.hathitrust.org/Record/000679311 American Ephemeris and Nautical Almanac, Washington, 1855–1980, Hathi Trust] * ''Astronomical almanac for the year 2001''. (2000). U.S. Nautical Almanac Office and [[HM Nautical Almanac Office|Her Majesty's Nautical Almanac Office]]. {{ISBN|9780117728431}}. * ''Astronomical almanac for the year 2017''. (2016). U.S. Naval Observatory and [[HM Nautical Almanac Office|Her Majesty's Nautical Almanac Office]]. {{ISBN|978-0-7077-41666}}. * [http://asa.usno.navy.mil/ ''Astronomical Almanac Online''] {{Webarchive|url=https://web.archive.org/web/20161224174302/http://asa.usno.navy.mil/static/files/2016/Astronomical_Constants_2016.pdf |date=December 24, 2016 }}. (2016). 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