Celestial Equator

Astronomical Dictionary

The projection of the Earth's equator upon the celestial sphere. Right ascension is the longitude measurement eastward along this circle from a specified vernal point. declination is measured along a great circle perpendicular to the celestial equator and passing through a body.

 
Astronomical [1] [2] [3] [4] [5] [6] [7] [8] [9]

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