"Rain" is the second solar term after beginning of spring. How did this solar term come from?

As we all know, rain is the second of the 24 solar terms, indicating the beginning of precipitation and the gradual increase of rainfall, so it is called "rain" in order to reflect the precipitation situation. In ancient times, it was recorded in the ancient book "Twenty-four Solar Terms". "In the first month, when there is clear water, there are trees in spring and water in wood, so there is rain after spring. When the east wind thaws, it will disperse into rain. " So "rain" means that the spring breeze gradually spreads all over the earth, the ice and snow melt, and even the air in the north becomes moist and prosperous.

In the rain solar term, when the weather gets warmer, the snowfall decreases and the rainfall increases, plants use this rain to absorb water and begin to sprout and grow. Crops are no exception, such as wheat seedlings and rape. If there is enough water during this period, the growth momentum of crops will be particularly good, and this year's harvest will have a good start. Rain is the second of the 24 solar terms. Every February 19 or so, when the longitude of the sun reaches 330 degrees, it is the rain in the twenty-four solar terms. At this time, the temperature rises, the ice and snow melt, and the precipitation increases, hence the name rain. Rainwater begins on February 18 or 19 and ends on March 4 or 5. Rain, Grain Rain, light snow and heavy snow are all solar terms reflecting precipitation.

"July 72": "In the first month, there is water for one day. Beginning of spring is wood, but the rain of wood must be water, so the rain after beginning of spring. When the east wind thaws, it will disperse into rain. " It means that before and after the rain, everything began to sprout, and spring came. For example, there are phenological records such as "swan" and "vegetation germination" after rain in Yizhoushu.

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