[ee-kwuh-noks, ek-wuh-] /ˈi kwəˌnɒks, ˈɛk wə-/

the time when the sun crosses the plane of the earth’s equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) and September 22 (autumnal equinox)
either of the points.
/ˈiːkwɪˌnɒks; ˈɛkwɪˌnɒks/
either of the two occasions, six months apart, when day and night are of equal length See vernal equinox, autumnal equinox
another name for equinoctial point

late 14c., from Old French equinoce (12c.) or directly from Medieval Latin equinoxium “equality of night (and day),” from Latin aequinoctium “the equinoxes,” from aequus “equal” (see equal (adj.)) + nox (genitive noctis) “night” (see night). The Old English translation was efnniht. Related: Equinoctial.

equinox [(ee-kwuh-noks, ek-wuh-noks)]

The twice yearly times when the lengths of day and night are equal. At equinox, the sun is directly over the Earth’s equator. The vernal equinox occurs about March 22 and the autumnal equinox about September 21.


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