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The sun crosses the plane of the earth’s equator twice a year: on or about March 21 (the Vernal Equinox) and again six months later, on or about September 22 or 23 (the Autumnal Equinox). On these two occasions, night and day are of equal length all over the world. In the Northern Hemisphere, September 22 or 23 is the first day of autumn. Autumnal Equinox Day is a national holiday in Japan, observed on either September 23 or 24 to celebrate the arrival of autumn and to honor family ancestors. Discuss
Source: The Free Dictionary