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描述: Article by Peter Brosche on gaining understanding of changes in the Moon's orbit.
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网站主题: astronomy
World history of astronomy and timekeeping with updates, and origins, based on original sources and places where possible.
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Tiki-Toki is web-based software for creating beautiful interactive timelines that you can share on the internet.
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Internetseite des Argelander Instituts fuer Astronomie der Universitaet Bonn
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The mathematics and rule explanation for the calendar.
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Research in the planetary system, stellar atmospheres, the Milky Way galaxy, extragalactic astronomy, and observational astronomy.
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Vereniging op de bres voor een goed gemotiveerd en uitgerust leger. Over de activiteiten, bijeenkomsten en het magazine Armex.
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The Home of Amateur Astronomy in the UK by Michael Oates
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