Brief introduction to the encyclopedia of rainwater solar terms knowledge

1. Water is the second of the 24 solar terms. Generally speaking, from February 18 or February 19, when the longitude of the sun reaches 330 degrees, it is rain in the 24 solar terms. At this time, the temperature rises, the snow melts and the precipitation increases, hence the name rain. The rain solar term generally starts from February 18 or 19 and ends on March 4 or 5. Rain, like Grain Rain, light snow and heavy snow, is a solar term reflecting precipitation.

2. "Twenty-four solar terms": "In the first month, life is full of water. Spring belongs to wood, but there must be water for those who grow wood, so there is rain in beginning of spring. If the east wind melts, it will disperse into rain. " It means that everything begins to sprout before and after the rain and solar terms, and spring is coming. For example, Yizhoushu has phenological records such as "Hongyan coming" and "vegetation sprouting" after the rain.

3. In ancient China, rainwater was divided into three stages: "One stage was that Rex sacrificed fish; Second, wait for Hongyan to come; Third, wait for the grass to sprout. " In this solar term, otters start fishing and put the fish on the shore, as if they were sacrificed first and then eaten; Five days later, the geese began to fly back to the north from the south; In five days, in the "moist and silent" spring rain, the sun rises everywhere in the vegetation and begins to sprout. Since then, the earth has gradually begun to show a thriving scene.

Rain not only indicates the beginning and increase of rainfall, but also indicates the rise of temperature. It was cold before it rained. After the rain, people obviously feel that spring has returned to the earth, which warms bloom, fills the world with spring and invigorates the body and mind.

5. The low-temperature rain and snow weather has passed in most parts of the country, and the rainfall gradually increases after it begins to rain, which is conducive to the greening or growth of overwintering crops. It is necessary to pay close attention to the field management of overwintering crops and make good preparations for seed selection, spring ploughing, fertilization and other spring ploughing and sowing. 15 of the rainy solar term, we go from the sixth day of July to the second day of September, "Eighty-nine swallows bloom on the ninth river in July, and cattle are cultivated everywhere on September 9th and 19th", which means that most areas in the northwest, northeast and southwest plateaus are still in the cold winter, and many other areas are experiencing or have completed the transition from winter to spring. Urged by the spring breeze and rain, the vast rural areas began.

6. However, in the rainy season, cold air activities in the north are still frequent and the weather is changeable. Since we talk about the frequent cold air activities in the next season, we can't help but mention what people often say about "spring cover". This is the principle of keeping in good health put forward by the ancients according to the characteristics of spring climate change. In early spring, the sun is shining, the climate is getting warmer and warmer, and people gradually go to cotton and wear light clothes. But at this time, it is still cloudy and cold in the north, and the temperature changes greatly. Although the rainy season is not as cold as the winter, the human skin has become relatively slack, and the resistance to the evil of wind-cold will also be weakened, so it is easy to get sick by evil. So it makes sense to pay attention to the "spring cover" at this time. This changeable weather is easy to cause people's mood swings and even anxiety, which affects people's physical and mental health, especially those with hypertension, heart disease and asthma. In order to eliminate these unfavorable factors, besides continuing to cover in spring, we should also carry out active mental health exercise. Maintaining emotional stability plays a very important role in physical and mental health.

8. After the rain, the spring breeze warms up, and pathogenic bacteria and viruses are easy to spread with the wind, so infectious diseases tend to break out in spring. Everyone should protect themselves, pay attention to exercise, enhance their resistance and prevent diseases.

10. In the rainy solar term, the humid atmosphere gradually rises, and dew and frost appear in the morning. Therefore, in view of such climate characteristics, diet recuperation should be based on nourishing the spleen and stomach, expelling wind and removing dampness. Because the climate is cold at this time, it can be supplemented appropriately, such as honey, jujube, yam, tremella and so on.