- equinoctial - relating to the vicinity of the equator
- equinoctial - relating to an equinox (when the lengths or night and day are equal)
- equinoctial - relating to an equinox (when the lengths or night and day are equal)
- celestial equator, equinoctial circle, equinoctial line, equinoctial - the great circle on the celestial sphere midway between the celestial poles
--1 is a kind of great circle
--1 has particulars: right ascension