The Autumnal Equinox begins when the sun reaches 180 degrees of the ecliptic longitude from September 22 to 24 of the Gregorian calendar. It is the sixteenth solar term in the twenty-four solar terms and the fourth solar term in autumn. On the day of the Autumnal Equinox, day and night, cold and heat, yin and yang are evenly divided and in a balanced state. That is, "the heat retreats and the autumn becomes cool and refreshing, and the daylight and night are equally long."

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