Time: September 22~24 in Gregorian calendar every year.
Description:
1, the equinox begins with equal time between day and night. On this day, the sun reached the longitude 180 degrees and hit the equator of the earth directly. Therefore, in most parts of the world, 24 hours are divided equally between day and night, each being 12 hours.
After the autumnal equinox, the direct point of the sun began to enter the southern hemisphere from the equator, and the northern hemisphere began to have shorter days and longer nights, and the day began to be shorter than the night. Near the North Pole, there are long nights and stars for six months in a year.
2. The climate changes from hot to cold. According to the division of seasons in ancient China, which started with beginning of spring, Changxia, beginning of autumn and beginning of winter, the autumnal equinox is divided into 90 days in autumn and divided equally in autumn.
Climate: Most parts of China have entered a cool autumn. The cold air from the south meets the gradually decaying warm and humid air, which causes repeated precipitation and the temperature drops again and again. The daily precipitation after the autumnal equinox will not be very large. At this time, the field farming in the south and the north is different.
Extended information proverb:
1, the white dew is early, the cold dew is late, and the autumn equinox is the time to plant wheat.
Note: When you start planting wheat, you should choose a good solar term. The white dew is too early and the cold dew is too late. Only the autumn equinox is the best.
The autumnal equinox is evenly distributed between day and night.
Explanation: solar terms reach the autumnal equinox, and the length of day and night is equal.
3. The autumn equinox is cold and dew, so it is urgent to sow wheat.
Note: It is not too late to plant wheat in the autumn equinox.
4, harvest peanuts in the autumn equinox, late fruit leaves are lost.
Note: Peanuts should be picked at the autumnal equinox. If time is too late, the fruit inside will be gone.
5. Plant onions at the autumnal equinox and cover them with fertilizer in early winter.
Note: Onions planted at the autumnal equinox should be well fertilized when the branches are established.
Baidu encyclopedia-autumnal equinox