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Noun
1. equatorial coordinates
Wikipedia definition
2. Equatorial coordinate systemThe equatorial coordinate system is a widely-used method of specifying the positions of celestial objects. It may be implemented in spherical or rectangular coordinates, both defined by an origin at the center of the Earth, a fundamental plane consisting of the projection of the Earth's equator onto the celestial sphere, a primary direction towards the vernal equinox, and a right-handed convention.
Read “Equatorial coordinate system” on English Wikipedia
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