The Celestial equator reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Celestial equator

The celestial equator is a great circle on the imaginary celestial sphere, which could be constructed by inflating the Earth's equator until it intersects with said sphere. The celestial equator is inclined by ~23.5°, with respect to the ecliptic plane; a result of axial tilt.

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