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This handbook is an attempt to introduce a summary of the start of the universe, motion of planets, different calendars and the system of terrestrial and celestial coordinates. Time in geodetic astronomy is also introduced, which is an essential part of many applications and technologies such as GPS and others.According to the irregular motion of the earth, and to keep the terrestrial coordinates, celestial coordinates are modified to polar motion and seasonal variation.Some believe that using satellite observations could replace the astronomical determinations of the earth's positions, this...