Cultural connotation of autumnal equinox

The cultural connotation of the autumnal equinox is as follows:

1, the sixteenth solar term in the twenty-four solar terms of the lunar calendar, usually occurs from September 22nd to 24th every year at the autumnal equinox. The climate in the south began to decline from this solar term. First, on this day, the sun reached the longitude of the Yellow River 180 degrees, and directly hit the equator of the earth. Therefore, in most parts of the earth, 24 hours are divided equally, each being 12 hours. Near the North Pole and the South Pole, the special phenomenon of "the sun circles on the horizon all day" can be observed on this day.

2. After the autumnal equinox, the days in the northern hemisphere are short and the nights in the southern hemisphere are long. After the autumnal equinox, the polar night range near the North Pole and the polar sun range near the South Pole gradually expanded. According to the division of seasons in ancient China, which began with beginning of spring, Changxia, beginning of autumn and beginning of winter, the autumnal equinox falls within 90 days of autumn and is divided equally in autumn.

The autumnal equinox solar terms, not only in the north, but also in most parts of the south, began to enter autumn, and the summer heat quickly subsided. The so-called "half-combination of yin and yang" means that at the autumnal equinox, the qi and yin of heaven and earth flourish and yang decline, and they are close to each other. Compared with the lush summer, flowers and trees wither, plants and leaves fall, people's mood is also prone to produce a feeling of desolation and depression.