Synonyms:
equinoctial_point, equinox
Meaning: (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
Synonyms:
equinox
Meaning: either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
Usage examples
Professor Mitchell, to whom the fact was communicated, employed his assistants to ascertain the exact position of the heavenly bodies belonging to our solar system on the equinox of that year.