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equinox
noun
(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
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ˈɛkwɪˌnoks
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noun
(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
noun
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