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celestial coordinate system

(system for specifying position of celestial objects)

A celestial coordinate system is a system used to specify the position of an object in the sky. Some type of spherical polar coordinates is generally used, but they differ in their orientation, i.e., the direction of their axes. Some systems:

International Celestial Reference System is a system standardized by the International Astronomical Union and can be considered something of a refinement of equatorial coordinates.

(coordinates,equatorial,celestial sphere)

Referenced by:
plate measuring machine (APM)
celestial sphere
Catalogues of Fundamental Stars