Twenty-four solar terms: autumnal equinox

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The autumnal equinox is the sixteenth of the twenty-four solar terms and the fourth in autumn. Douzhiyou; the sun reaches 180° of the Yellow Longitude; it meets on September 22-24 of the Gregorian calendar every year. On the autumnal equinox, the sun is almost directly on the Earth’s equator, and day and night are equal in length around the world. On the autumnal equinox, “fen” means “equal division” and “half”. In addition to the equal division of day and night, there is also a layer of meaning equal to the division of autumn. After the autumn equinox, the position of direct sunlight moves southward, the days in the northern hemisphere are shorter and the nights are longer, the temperature difference between day and night increases, and the temperature drops day by day…

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