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Understanding the Celestial Coordinate System, Continued To help you visualize the celestial coordinate system, always imagine Earth at the center of the celestial sphere. These facts and figure 6-2 should help you visualize the celestial coordinate system. Facts The first point of Aries is the starting point for all celestial observations. Celestial bodies are in constant motion (that’s why it was stressed in chapter 5 that the exact time of a celestial observation must be recorded). The use of GHA associates all hour circles of any celestial body with the  Greenwich  meridian  on  Earth.  This  allows  all  celestial  bodies  to be positioned at any moment on the celestial sphere. The  GHA  of  Aries  will  align  Aries  with  the  Greenwich  meridian. Figure  6-2.  The  celestial  coordinate  system. 6-4

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