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The day that has equal light and dark is known as the equinox. There are two equinoxes each year: the vernal equinox in March and the autumnal equinox in September. On these days, day and night are approximately equal in length due to the position of the Earth relative to the Sun. This occurs when the Sun crosses the celestial equator, moving northward in March and southward in September.

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4w ago

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