Translate An equinox is the instant of time when the plane of Earths equator passes through the geometric center of the Suns disk. This occurs twice each year around 20 March and 23 September. In other words it is the moment at which the center of the visible Sun is directly above the equator. The word is derived from the Latin aequinoctium from aequus and nox. On the day of an equinox
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