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Date: 2016-05-02 17:16:29Celestial coordinate system Astrometry Astronomy Star position Barycentric celestial reference system Ecliptic Equinox Axial precession Epoch Sidereal time Nutation International Celestial Reference System | International Astronomical Union Standards Of Fundamental Astronomy SOFA Tools for Earth AttitudeAdd to Reading ListSource URL: www.iausofa.orgDownload Document from Source WebsiteFile Size: 507,11 KBShare Document on Facebook |