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astronomical coordinate system

astronomical coordinate system

[‚as·trə′näm·ə·kəl ‚kō′ȯrd·ə·nət ‚sis·təm]
(astronomy)
Any system of spherical coordinates serving to locate astronomical objects on the celestial sphere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Direct measurements are therefore done in the astronomical coordinate system but not in the geodetic coordinate system.
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