The solar term of the autumnal equinox in 202 1 year is at 3: 20: 55 on September 23rd, Gregorian calendar, and on Thursday, August 17th, the year of the lunar calendar. The autumnal equinox is the sixteenth solar term of the twenty-four solar terms and the fourth solar term in autumn. At this time, the sun reaches the ecliptic 180? ; It is celebrated on September 22-24 of the Gregorian calendar every year. The autumnal equinox means equal share and half share. On this day of the autumnal equinox, the sun shines almost directly on the equator of the earth, and the whole world is as long as day and night. After the autumnal equinox, the position of direct sunlight moved to the southern hemisphere, and the northern hemisphere got less and less solar radiation, but more heat was lost on the ground, and the temperature dropped significantly. By the autumn equinox, the summer heat has disappeared, and the weather has turned cold.

About the origin of beginning of autumn.

Beginning of autumn is the 13 solar term among the 24 solar terms, and the first solar term in autumn, which falls on August 7-9 of the Gregorian calendar every year. At this time, the bucket handle of the Big Dipper points to the southwest, and the sun reaches the yellow meridian 135? . The 24 solar terms reflect the changes of the four seasons' qi. beginning of autumn is the node where the yang gradually closes and the yin gradually grows, and the yang gradually turns into the yin. Beginning of autumn, which also means precipitation and humidity, is at the turning point of the year and tends to decline or decrease; In nature, everything began to grow from lush to mature. Beginning of autumn doesn't mean that the extremely hot weather is over. beginning of autumn is still in the summer heat period, and the summer heat doesn't come out until the second solar term in autumn, and the weather is still very hot in early autumn. The so-called heat is in the dog days, and it is said that it will fall after autumn, and there will be at least one volt of extremely hot weather after beginning of autumn. According to the calculation method of dog days, beginning of autumn is often still in the middle of the day, that is to say, the heat is not over, and the real coolness usually comes after the Millennium solar terms. The watershed between heat and cool is not in the solar term in beginning of autumn.

Proverbs about the autumn equinox

The white dew is early, the cold dew is late, and the autumn equinox is just the time to plant wheat.

Plant wheat at the right time and reap it every year, and there will be mistakes too early and too late.

Planting silt first and then planting sand, seven days is just right.

Late autumn crops should continue to be managed, and they should be harvested as they mature.

Cotton is sprayed in the middle and picked up once every four to six days.

The quality of medium-sprayed cotton is good, and it is timely to keep the single seed.

Continue to engage in silage straw, and the livestock breeding machine will not be lost.