A great circle separating the northern and southern hemispheres of the celestial sphere and lying in the same plane as the Earth's equator. The celestial equator is a projection of the Earth's equator outward onto the celestial sphere and is used as the reference point in determining a celestial body's declination .
the great circle on the celestial sphere midway between the celestial poles
Find another word for equinoctial. In this page you can discover 6 synonyms, antonyms, idiomatic expressions, and related words for equinoctial, like: celestial-equator, equinoctial circle, equinoctial line, solsticial, solstitial and vernal-equinox.