What is the origin of rain in 24 solar terms?

Rain is the second solar term in 24 solar terms. Around February 18 every year, the temperature rises, the snow melts and the precipitation increases, so it is named rain.

Only by truly understanding the solar terms can we find that behind each solar term lies the wisdom of life that people have struggled with nature for thousands of years, which can also help modern people to better cope with the weather changes.

First, the origin of rain:

From the meteorological point of view, when the sun reaches 33 longitude, the direct point of the sun begins to gradually approach the equator from the southern hemisphere. At this time, in the northern hemisphere, the sunshine hours and intensity are increasing, the temperature rises rapidly, and the warm and humid air from the ocean becomes active and gradually advances northward; At the same time, cold air is not to be outdone in the weakening trend, and it frequently competes with warm air to form rainfall. This is the reason for the increase in precipitation and the origin of the name of rain.

In the ancient book twenty-four solar term, rain was explained as follows: "In the first month, water was born in the sky, and it was a tree at the beginning of spring. However, those who grow trees must have water, so beginning of spring succeeded in rain. And if the east wind thaws, it will disperse into rain. "

The rain in this article has two meanings, one is that the weather is getting warmer and the precipitation is increasing gradually, and the other is that in the form of precipitation, there is less snow and more rain. So the meaning of this sentence is that in the middle of January in spring, visible moist water vapor will be generated between heaven and earth, and spring belongs to wood, and Chunmu must be moistened by water if it wants to spread, so there will be a rain that nourishes spring after beginning of spring. And the warm wind from the east will dissolve the air conditioning in the sky, and the air conditioning will dissipate into rain.

Second, the three periods of rain

In ancient times, rain was divided into three periods:

One period was for rex to sacrifice fish.

Because the fish in the water become more active in rainy season, otters have to eat more fish for breeding offspring, so after they catch fish, they will put them on the shore first, and when a certain number of fish are caught, they will stand upright and sort out their prey with their upper limbs. This picture is very similar to people's grand sacrifice, so people call this behavior "Rex Festival".

wait for Hongyan to come.

In rainy season, the temperature in the north gradually rises to the temperature suitable for the survival of geese, so geese begin to move northward. At this time, we can see the scene of flying back to the north on a large scale, so when there is rain, the festival geese come.

the vegetation sprouted in three seasons.

In rainy season, the temperature rises, and the ground temperature becomes suitable for the growth of vegetation. Coupled with the moisture of rain, all vegetation begins to revive and germinate.

Third, farming activities in rainy season:

1. Vegetable farming

Although the sun is rising and the weather is getting warmer in rainy season, it is often accompanied by "late spring cold". When the weather is cold, it is necessary to strengthen anti-freezing and warmth, but also to ventilate in time to prevent stuffy seedlings. In the area south of Huaihe River, there is a lot of rain, so it is necessary to do a good job in clearing ditches and draining water from farmland and weeding in intertillage to prevent wet damage and root rot.

However, in North China, Northwest China and Huanghuai area, there is generally less precipitation at this time, which often cannot meet the needs of crops. If there is little rain in early spring, spring irrigation should be done in time before and after the solar term, which can achieve good results, that is, "spring rain and spring water are as expensive as oil".

2. Fruit tree farming

With the arrival of rain, not only the plants and trees began to glow, but also the pests and diseases became active. Therefore, it is necessary to clean the fallen leaves, diseased fruits, diseased branches, insect fruits, weeds, discarded fruit bags and sundries in the orchard in time, and concentrate on burying or burning them to eliminate the hidden pests and diseases in the orchard. It is also necessary to fertilize in time to avoid insufficient nutrients and fragile new branches when they resume growth.

3. Cultivate the soil and cultivate the land

Spring is an important time for spring ploughing and sowing. It is necessary to prepare sufficient agricultural production materials such as seeds, pesticides, fertilizers and plastic films, repair the required agricultural machinery and equipment, and prepare for spring ploughing. At this time, the work of raising seedlings of double-cropping early rice in South China has begun. In order to prevent the harm of cold and hot weather and cold weather, we should pay attention to the "cold tail and warm head" weather and grab the sunny sowing.

The significance of each solar term is not only to record and label the climate and weather, but also to make you feel the passage of time more clearly through the change of solar terms, so that each stage can be more meaningful.