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Vernal Equinox (Spring)
The date (near March 21 in the northern hemisphere) when night and day are nearly the same length and Sun crosses the celestial equator . The first day of Spring.
Autumnal Equinox
The date (near September 22 in the northern hemisphere) when night and day are nearly of the same length and Sun crosses the celestial equator. The first day of Autumn (Fall).
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