Толковый словарь английского языка Oxford English Reference - equinox
Equinox
equinox
n. 1 the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length. 2 = equinoctial point. Phrases and idioms autumn (or autumnal) equinox about 22 Sept. spring (or vernal) equinox about 20 March. Etymology: ME f. OF equinoxe or med.L equinoxium for L aequinoctium (as EQUI-, nox noctis night)
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1.
noun see: night Date: 14th century either of the two points on the celestial sphere where the celestial equator intersects the ecliptic, either of the two times each year (as about March 21 and September 23) when the sun crosses the equator and day and night are everywhere on earth of approximately equal length ...Толковый словарь английского языка
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