Which solar term has more clouds?

In summer, people ask that there is a saying that "clever clouds are seen in July and August", and "clever clouds" refers to the ever-changing clouds in July of the lunar calendar.

Qiao Yun in July refers to the overlapping convective clouds formed in July due to the evaporation of water vapor on the ground caused by high temperature and scorching sun. Clouds in the sky change into various shapes.

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1. What is summer heat?

Summer is one of the 24 solar terms. The annual summer solar term is around August 23rd. At this time, the sun reaches longitude 150. According to the "twenty-four solar terms", "go and go again, and the summer heat ends here." It means that the hot summer is coming to an end.

Although the average daily temperature in Beijing, Taiwan, Taiyuan, Xi, Chengdu, the vast areas to the east and south of Guiyang, and the Tarim Basin in Xinjiang are still above 22 degrees Celsius, it is in summer, but at this time, the cold air going south is increasing and the temperature is gradually decreasing.

After summer, autumn is getting stronger, which is a good time for people to swim in the countryside to welcome autumn scenery. After the heat, even the clouds in the sky seem to be evacuated and free, unlike the thick clouds in the heat. There has always been a saying among the people that "seeing a clever cloud in July and August" means "going out to welcome autumn".

Astronomical experts say that on that day in summer, the direct point of the sun has moved from 23 26' north latitude to1128' north latitude. In the urban area of Beijing, the length of a day is shortened from 15 hours to 13 hours and 25 minutes, and the height of the sun at noon is also reduced from 73 32' to 6134', so people can clearly feel that the sun is moving southward.

As the height of the sun decreases, the heat it brings will also decrease.

Second, the origin of summer solar terms

According to the "24 solar terms", "Go where you go, and the summer heat will stop here.

It means that the hot summer is coming to an end. Although the average daily temperature in Beijing, Taiwan, Taiyuan, Xi, Chengdu, the vast areas to the east and south of Guiyang, and the Tarim Basin in Xinjiang are still above 22 degrees Celsius, it is in summer, but at this time, the cold air going south is increasing and the temperature is gradually decreasing.

In ancient China, the summer heat was divided into three stages: "The eagle is a sacrificial bird; Second, wait for the beginning of heaven and earth; Three Hou Wonaideng. " In this solar term, eagles began to prey on birds in large numbers; Everything between heaven and earth began to wither; "Henaideng" refers to millet, millet, rice and sorghum crops, and "Deng" means maturity.

Summer is a solar term reflecting the temperature change. "Chu" means hiding, ending, and the hot summer means that the hot summer is over. In other words, the hot summer is coming to an end, that's all. After the summer, except South China and Southwest China; The rainy season is coming to an end in most parts of China, and the precipitation is gradually decreasing.

Especially in North China, Northeast China and Northwest China, we must pay close attention to water storage and moisture conservation. If there is drought during autumn sowing, the sowing date of winter crops will be postponed.