Climatic Characteristics of Mid-Autumn Equinox in 24 solar terms

The climatic characteristics of the autumnal equinox of the twenty-four solar terms are that the Yangtze River basin and its vast area to the north have entered autumn, and the daily average temperature has dropped below 22℃. The cold air mass in the north has begun to have a certain impact. The rainy season has just ended in most areas, with a cool breeze blowing gently. It is a beautiful and pleasant season.

The ancients summarized the change of the autumnal equinox into three stages: in one stage, the thunder began to stop; Second, insects are blank households; After three waits, the water began to dry up. Generally speaking, after the arrival of the autumnal equinox, the weather of thunder will not appear again; Insects also hid in caves and began to seal holes to resist the arrival of cold weather; Rainfall gradually decreased and water in some places began to dry up.

The autumnal equinox is the sixteenth solar term among the twenty-four solar terms and the fourth solar term in autumn. Fight refers to unitary; The sun reaches the yellow meridian180; Celebrated on September 22-24 of the Gregorian calendar every year. On the day of the autumnal equinox, the sun shines almost directly on the equator of the earth, and the length of day and night is equal all over the world.

rural activity

The characteristics of rapid cooling in autumn make "Sanqiu solar terms for health" particularly tense in the busy autumn harvest, autumn ploughing and autumn planting. In the autumn equinox, cotton flours and tobacco leaves turn from green to yellow, which is a good time to harvest. Winter wheat has been planted in North China, and the Yangtze River basin and vast areas in the south are busy harvesting late rice, ploughing the land and preparing for rape sowing.

Drought and lack of rainfall or continuous rainfall in autumn equinox are the main unfavorable factors affecting the normal operation of Sanqiu, especially the continuous rainfall will make the upcoming crops lodging, mildewing or sprouting, resulting in serious losses. "Sanqiu" is very busy, and the word "early" is the most important. Timely harvest of crops in autumn can avoid the harm of first frost and continuous rain, and timely sowing of crops in winter can make full use of heat resources before winter, cultivate strong seedlings to survive the winter safely, and lay the foundation for high yield in the coming year.