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Equinox
01
(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
02
either of the two moments in a year when the Sun, in its apparent motion along the ecliptic, crosses the celestial equator, resulting in approximately equal periods of daylight and darkness worldwide
Examples
The spring equinox marks the beginning of spring in the Northern Hemisphere.
During the autumn equinox, the length of day and night are nearly equal.
