(astronomy) Of or relating to the spring or autumnal equinox. / (astronomy) Of or relating to the celestial equator. / (uncommon) Equatorial: Of or relating to the equator of the Earth.

The great circle midway between the celestial poles; the celestial equator. / (rare) The terrestrial equator. / An equinoctial gale.

plural of equinoctial

In an equinoctial manner; relative to the equinox.

solar year

(astronomy) A meridian on the celestial sphere where the sun crosses it on equinoxes.

plural of equinoctial colure

plural of equinoctial year

celestial equator

(obsolete) celestial equator / (obsolete, rare) the Equator