What is the origin of rain in the 24 solar terms?

Rain is the second of the 24 solar terms. Every February 18 or so, the temperature rises, the snow melts and the precipitation increases, hence the name rain.

Only by truly understanding the solar terms can we find that there are thousands of years of life wisdom behind each solar term, and it can also enable modern people to better cope with the changes in the weather.

First, the origin of rain:

From the meteorological point of view, when the sun reaches 330 longitude, the direct point of the sun begins to approach the equator from the southern hemisphere. At this time, the sunshine hours and intensity in the northern hemisphere are increasing, the temperature is rising rapidly, and the warm and humid air from the ocean begins to be 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 rain.

In the ancient book "Twenty-four Solar Terms", rain was explained as follows: "In the first month, water fell from the sky, and beginning of spring belonged to wood. However, those who grow wood must also have water, so it rained successfully in beginning of spring. If the east wind melts, it will disperse into rain. "

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

Second, the three stages of rain

In ancient times, rainwater was divided into three stages:

Waiting for Tyrannosaurus Rex to sacrifice fish.

Because in the rainy season, the fish in the water become more active, and otters eat more fish in order to breed offspring, so they will put the fish on the shore first, and when they catch a certain number of fish, they will stand upright and sort out their prey with their upper limbs. This picture looks like a big sacrifice of human beings, so people call this behavior "Rex Day".

Wait for Hongyan to come.

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

Third, vegetation is sprouting.

When the temperature rises in rainy season, the ground temperature becomes suitable for the growth of vegetation. Coupled with the rain, all the vegetation began to revive and sprout.

Three, the rainy season farming activities:

1, vegetable planting

Although the sun rises and the weather gets warmer in the rainy season, it is often accompanied by "cold spring". When the weather is cold, it is necessary to strengthen anti-freezing and warmth, and to ventilate in time to prevent the seedlings from being suffocated. There is more rain in the area south of Huaihe River, so it is necessary to do a good job of ditch cleaning, drainage and intertillage weeding to prevent wet damage and root rot.

However, in North China, Northwest China and Huanghuai areas, the precipitation is generally less at this time, which often cannot meet the needs of crops. If there is little rain in early spring, spring irrigation should be carried out 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 agriculture

With the arrival of rain, not only plants and trees began to regain their vitality, but also pests and diseases began to become active. Therefore, it is necessary to clean up fallen leaves, diseased fruits, diseased branches, insect fruits, weeds, discarded fruit bags and sundries in the orchard in time, and bury or burn them centrally to eliminate hidden pests and diseases in the orchard. It is also necessary to apply fertilizer in time to avoid insufficient nutrients and fragile new branches when resuming growth.

3. Farming farmland

Spring is an important time for spring ploughing and sowing. It is necessary to prepare enough agricultural means of production such as seeds, pesticides, fertilizers and plastic films, maintain 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 seize the sunny sowing.

The significance of each solar term is not only to record and mark the climate and weather, but more importantly, to make you feel the passage of time more clearly through the changes of solar terms and make each stage more meaningful.