celestial equator ce·les·tia·lequator uncommon noun 1. the great circle on the celestial sphere midway between the celestial poles Synonymscelestial equatorequinoctial circleequinoctial lineequinoctial Related words Broader terms great circle Narrower terms right ascension WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
