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Definition equinox

Etymology

From Old French equinoce (French équinoxe), from Medieval Latin equinoxium, from Latin aequinoctium, from aequus (“equal”) + nox (“night”). Replaced Old English efenniht (Modern English evennight).

Noun

equinox (plural equinoxes or equinoctes)

1. (astronomy) The intersection of the apparent path of the sun in the sky (the ecliptic) with the celestial equator.
2. One of the two days on which this intersection occurs each year: (for the Northern hemisphere) March 20 or 21 in the spring and September 22 or 23 in the autumn.

Results 25 Words with the letters EQUINOX

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