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What are the coordinate axes in astronomical coordinate systems?

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In astronomical coordinate systems , the coordinate axes are great circles on the celestial sphere. In most systems of this type, the reference points are fixed on the sphere, so the two coordinates needed to locate a body are relatively constant.

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Similar questions: Which type of system has axes that are great circles on the celestial sphere? Are the reference points of an astronomical coordinate system fixed on the sphere? [ Hide these questions ]

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