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Date: 2010-12-05 07:59:19Celestial mechanics Units of time Calendars Astrodynamics Celestial coordinate system Tropical year Axial tilt Orbital eccentricity Year Astrology Measurement Astronomy | ☼ Tropical Events: the solstices and equinoxesAdd to Reading ListSource URL: www.thetropicalevents.comDownload Document from Source WebsiteFile Size: 1,78 MBShare Document on Facebook |