At 4:02 on September 23, Beijing time, we will usher in the "autumn equinox" in the 24 solar terms of the lunar calendar. Day and night will be equally divided again after the spring equinox.

The Autumn Equinox is the 16th solar term among the 24 solar terms in the lunar calendar, and it falls around September 23rd in the Gregorian calendar every year. The autumnal equinox happens to be in the middle of the 90 days of autumn, which means "equal autumn colors", so it is called "Autumnal Equinox". On this day, the sun shines directly on the Earth's equator, distributing light and warmth evenly to the northern and southern hemispheres. The ancient book "Spring and Autumn Fanlu" said: "At the autumnal equinox, yin and yang are half-phase, so the day and night are even and the cold and heat are equal."

Since the autumnal equinox, the direct sunlight point has increasingly shifted to the southern hemisphere, and the day is shorter than the night. It gets worse day by day until the winter solstice.

At the autumnal equinox, there is a cool breeze, blue sky, sunny wind, crisp autumn air, fragrant osmanthus, and crabs are fat and chrysanthemums are yellow. It is a beautiful and pleasant season. At the same time, it is also an important solar term in agricultural production.

Zhao Zhiheng said that this season is the busy time of the "three autumns" of autumn harvest, autumn plowing and autumn planting. Most parts of our country have entered the autumn harvest season. Farmers are busy harvesting and drying grains in fields, fields and courtyards. Golden everywhere.

"The night of the autumnal equinox is white with dew, and one night is cold." Health experts suggest that during this season, in order to prevent catching colds, the public should pay attention to diet, strengthen self-care, and add autumn clothes in time.