Main Page | See live article | Alphabetical index 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. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.