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![]() Date: 2010-07-17 11:06:44Calendars Units of time Celestial coordinate system Celestial mechanics Tropical year Ecliptic Equinox Solstice Axial precession Measurement Astrology Astronomy | Source URL: www.math.nus.edu.sgDownload Document from Source WebsiteFile Size: 1.013,12 KBShare Document on Facebook |