The autumnal equinox of 202 1 is the start date of beginning of autumn.

What is the autumnal equinox of 202 1?

The solar term of the autumnal equinox 202 1 is 3: 20: 55 on September 23, 20021year, which is Thursday, August 17th of the lunar calendar. The autumnal equinox is the sixteenth solar term among the twenty-four solar terms and the fourth solar term in autumn. At this time, the sun reaches 180? ; Celebrated on September 22-24 of the Gregorian calendar every year. The autumnal equinox means equal share and half share. On the 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 direct sunlight moved to the southern hemisphere, and the northern hemisphere got less and less solar radiation, but the ground lost more heat 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, the 13 solar term in 24 solar terms, is 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 southwest, and the sun reaches longitude 135? . The twenty-four solar terms reflect the changes of qi in the four seasons. Beginning of autumn is the node where yang gradually closes, yin gradually grows, and yang gradually turns into yin. Beginning of autumn, which also means precipitation and humidity, is at the turning point of the year, with a downward or decreasing trend; In nature, everything begins to grow from lush to mature. Beginning of autumn doesn't mean the extreme hot weather is over. Beginning of autumn is still in the summer heat period, and the summer heat will not come out until the second solar term in autumn. It's still very hot in early autumn. The so-called hot summer is in dog days. It is said that it will fall after beginning of autumn, and there will be at least one volt of extremely hot weather after beginning of autumn. According to the calculation method in dog days, beginning of autumn is often still at noon, that is to say, the heat is not over yet, and the real coolness usually comes after the Millennium solar terms. The watershed of summer heat is not in the solar terms in beginning of autumn.

Proverbs about the autumnal equinox

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

Planting wheat at the right time and harvesting it every year will make mistakes too early or too late.

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

Late autumn crops should continue to be managed and harvested when they are ripe.

Spray cotton in the middle and pick it once every four to six days.

The quality of medium-sprayed cotton is good, and the single species is kept in time.

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