Rain is a solar term full of life connotation. What changes have taken place in natural phenology?

It's still snowing in parts of northern China, and it's still cold and windy. But in the southwest, most areas in the south of the Yangtze River are the scene of early spring, with warm sunshine, wet and cold in the morning and evening, green fields and full of spring; There is a saying in southern Yunnan that "the spring garden can't be closed, and there is an almond in the wall". Rain is the second of the 24 solar terms, and it is also a ruler used by our ancestors to calculate and remember the sun and the moon. In the rainy season, the sunshine is further strengthened, the temperature rises, the snow melts and the precipitation increases.

Delighting in Rain on a Spring Night describes the natural landscape at this stage. There are four solar terms reflecting precipitation, namely rain, Grain Rain, light snow and heavy snow. Rain and Grain Rain are positive growth, while light snow and heavy snow are negative growth. Between heavy snow and winter solstice, the process of "the cathode will reverse" and "the sun will grow in winter solstice" is displayed. From the solstice of winter, the transformation of Yin and Yang will enter the next cycle. Grain Rain, full valley, light snow and heavy snow are all the same solar terms reflecting precipitation. At this time, the direct point of the sun moved from the southern hemisphere to the equator, and the length and intensity of the northern hemisphere increased day by day. When the ice and snow melt, the rain increases, so it is called rain.

However, the precipitation level at this time is mainly light rain or Mao Mao rain. As the saying goes, "Spring rain is as expensive as oil", and proper precipitation is very important for the growth of crops. Twenty-four solar terms originated in the Yellow River Basin. Henan is the center of the Yellow River basin, with rich products. Children in the Central Plains generally use 24 solar terms to guide agricultural production. It was cold before it rained; After the rain, people obviously feel that spring has returned to the earth, which warms bloom and is full of spring. The breath of Qin people is exciting.

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