When did beginning of autumn start to fall?

They are: vernal equinox, Grain Rain, beginning of autumn, first summer, first frost and winter solstice.

At the vernal equinox, the time is around March 20 every year, and the sun reaches 0 longitude of the Yellow River. The significance of the vernal equinox, first, refers to the equal division of day and night, each of which is 12 hours; Second, in ancient times, it was spring from beginning of spring to long summer, and the vernal equinox happened to be in the three months of spring, and spring was equally divided.

In Grain Rain, the time is around April 20th every year, and the sun reaches 30. Grain Rain is the last solar term in spring, and the arrival of Grain Rain solar term means that the cold wave weather is basically over, and the temperature rises rapidly, which is very beneficial to the growth of cereal crops.

The sun reaches 135 in beginning of autumn around August 8th every year. Beginning of autumn is the first solar term in autumn, which marks the official start of autumn. "Autumn" means cool in summer.

In summer, the sun reaches 150 around August 23rd every year. Being in the heat is "out of the heat", that is, out of the heat. Summer solar terms mean that we are about to enter the autumn with meteorological significance. After the summer, the temperature in the area north of the Yellow River in China gradually drops.

The first frost occurs around1October 23rd every year, 10, and the sun is at 2 10. The first frost solar term means that the weather is getting colder and the first frost appears. It is the last solar term in autumn, which also means that winter is about to begin.

Winter solstice, the time is about 65438+February 22 every year, and the sun reaches 270 degrees of the yellow meridian. The solstice of winter marks the arrival of cold winter.