On February 19, the rainy season was ushered in. This is the second of the 24 solar terms. Rainwater, like solar terms such as Grain Rain, Xiaoman, light snow and heavy snow, is a solar term that reflects the precipitation phenomenon and the ancient farming culture.
During the rainy solar term, the direct point of the sun is gradually approaching the equator from the southern hemisphere. At this time, the sunshine hours and intensity are increasing in the northern hemisphere, and the temperature rises rapidly. The warm and humid air from the ocean becomes active and gradually advances northward to meet the cold air, forming rainfall. In rainy season, the weather is changeable, which is one of the seasons with the most cold wave process in the whole year, with cold and hot, warm and cold at first.
The climate intention of rain solar terms means that the probability of rainfall in the middle and lower reaches of the Yellow River where solar terms originated is higher than that of snowfall. The ancients said: "When the east wind thaws, the ice and snow are scattered into water and turned into rain, hence the name rain". Rainwater solar terms should contain three meanings, one is melting, the other is the increase of total precipitation, and the third is the decrease of snowfall. With the increase of precipitation, the speed of recovery has slowed down. Among the six solar terms in spring, the temperature increase during the rainy period is the smallest. From snow to rain, from freezing to melting is a particularly time-consuming and energy-consuming thing, which is one of the reasons for the lack of recovery during the rainy season.
At this time, although the snowfall began to decrease, it didn’t end. The Yellow River Basin often had snow break during Qingming Festival, and Grain Rain had frost break. Frost and snow may occur in any solar term in spring. An old saying goes, "There will be peach blossom snow in March and plum cream in April." As far as the climate is concerned, the last snow in most areas, that is, the last snow, is from rain to solar terms.
The meaning of rain solar term is also the beginning of rainfall, and the rainfall level is mainly light rain or drizzle. As the saying goes, "Spring rain is as expensive as oil", and suitable precipitation is very important for the growth of crops, which is a reflection of farming culture for festivals. Entering the rain solar term, there is no spring breath in the northern part of China, but most places in the south are full of spring, a scene of early spring.
Generally speaking, the rain solar term means that, first, the weather is getting warmer and the precipitation is gradually increasing; Second, in the form of precipitation, there is less snow and more rain. In the eyes of the ancients, the phenological signs of rain are: waiting for rex to sacrifice fish, waiting for Yanbei to return, and waiting for vegetation to sprout.
Rex sacrifices fish, that is, the east wind thawed, and otters began to fish, eating and showing off in an ostentatious manner on the shore. It puts the fish on the shore, just like displaying offerings for sacrifice, and then eats it, making it look like a ceremony.
When the geese return to the north, it means that the geese fly north. The river opened in beginning of spring, and the geese came when it rained. It’s a wild goose, not a swallow. The ancients said that the first stage of the vernal equinox was the arrival of a mysterious bird, that is, the arrival of a swallow. Therefore, "deja vu Yan returns" is in the vernal equinox, not in the rain. Roughly speaking, Xiaoyan goes from spring to autumn, and geese come in winter and go in summer. They are called migratory birds because they are phenological phenomena.
The vegetation germinates, that is, the vegetation begins to sprout. Now we often say, "What happened?" This "occurrence" used to be a special word to describe spring. Erya said: "Winter is peaceful, and spring is happening." Occurrence originally refers to germination and growth. However, in rainy season, the grass color is often far away, but there is nothing. If there is anything, maybe this is the "most benefit of spring" in the eyes of the world. In the south, the rain solar term is called "the season of ploughing", which means that spring ploughing can be carried out one after another.
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