equinox

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equinoxsearch for term: The time of year when the Sun is located in the sky at the intersection of the ecliptic and the celestial equator. Two such points exist: the vernal equinox, which is approximately March 21, marks the start of spring, and the autumnal equinox, approximately September 20, marks the start of autumn. At each of these points, the Sun rises due east and sets due west, and every place on Earth receives 12 hours of daylight and 12 hours of darkness.