The name Xiao Man has two meanings. First, it is related to climate and precipitation. During the Xiaoman solar term, the rainstorm in the south began to increase and the precipitation was frequent; As the folk saying goes, "Small and full, rivers are getting full". The "fullness" in the small fullness refers to the surplus of rain. Second, it is related to agricultural wheat. There is little or no rain during the Xiaoman solar term in the northern region. This "fullness" does not mean precipitation, but refers to the fullness of wheat. ?

During the Xiaoman solar term, there is usually a lot of rainfall in southern China. The warm and humid air flow from the ocean is active and meets the cold air coming from the north to the south. At this time, there will often be continuous and large-scale heavy precipitation in South China, causing heavy rain or torrential rain.

Jiangnan area is often full of rivers and lakes. If there is less rain at this stage, it may be that the subtropical high in the Pacific Ocean is weak and located to the south, which means it is Huangmei season. In the north, there is little or no rain during the Xiaoman solar term, during which the temperature rises rapidly and the temperature difference with the south further narrows.

Phenomena of Xiaoman solar terms

Wu Cheng, a scholar in Yuan Dynasty, edited twenty-four solar term. He divided the 24 solar terms into "seventy-two periods" and each solar term into three periods according to the scenery around the Yellow River basin and the characteristics of the 24 solar terms. Xiaoman waits for three times: "Wait for the bitter vegetable show, wait for the grass to die, and wait for the wheat to arrive in autumn."

It means that bitter vegetables have flourished after the solar term. After that, some grass with soft branches that like shade began to die in the strong sunlight; In the last period of Xiaoman, the wheat began to mature. The third period was originally written about the summer solstice, and later some works were changed to the wheat autumn solstice. Although it is still summer, it is mature "autumn" for wheat.

Summer is the season when winter wheat ripens in the north, while autumn is the season when grain ripens, so the ancients extended the term early summer to wheat autumn (the season when wheat ripens).

what are the above references? Baidu encyclopedia-xiaoman