Which four solar terms mark the beginning of the four seasons?
1, beginning of spring: beginning of spring is divided from astronomy. It usually starts on February 3-5, and when it arrives at the beginning of spring, people obviously feel that the days are getting longer and the sun is getting warmer. Temperature, sunshine and rainfall are often at the turning point of the year and tend to rise or increase. The growth of crops in early spring is accelerated, and the water consumption for bolting rape and jointing wheat is increased.
2. Long summer: refers to the beginning of summer. However, the temperature varies from place to place, and the time of entering summer is actually inconsistent. According to the climatological standard that the five-day average temperature in summer is higher than 22℃, the southern Sichuan basin has just entered summer before and after the long summer; The temperature in other basins is about 20℃, and it is still in the late spring season when "there is no one outside to ask the flowers to fall, and Ran Ran is covered with greenery all over the world"; The low-altitude valley in southwest Sichuan felt the heat in summer as early as mid-April, and the temperature in long summer was above 24℃.
3. beginning of autumn: After beginning of autumn, at the jointing and booting stage of late rice in Sichuan Basin, cotton bolls cracked and vomited; Mid-season rice and summer corn enter the stage of filling maturity to prevent the harm of hail, strong wind and heavy rain. In the basin behind beginning of autumn, although the season is still midsummer, there will soon be a golden "autumn" in which "beginning of autumn is full of yellow in ten days".
4. beginning of winter: It means that winter has begun. On that day in beginning of winter, the water began to freeze and the ground began to freeze. People often take the cold north wind and cold frost and snow as symbols of winter. In the later period of beginning of winter, strong cold air attacks more, and the temperature often drops greatly. In some years in the northwest of the basin, there is early frost in early winter. At this time, the plateau area is already in the dry season, the humidity decreases rapidly and the wind speed increases gradually.
Solar terms refer to:
Solar term is a special festival in the trunk and branch calendar that expresses the change of natural rhythm and establishes "December construction" (monthly order). The 24 solar terms are: beginning of spring, Rain, Sting, Equinox, Qingming, Grain Rain, Changxia, Xiaoman, Mangzhong, Summer Solstice, Xiaoxia, Daxia, beginning of autumn, Early Summer, Bailu, Autumn Equinox, Cold Dew, Early Frost, beginning of winter, Light Snow, Heavy Snow, Winter Solstice, Slight Cold and Severe Cold.
The twenty-four solar terms are related to cadres and gossip and have a long history. In the historical development, the 24 solar terms have been incorporated into the lunar calendar and become an important part of the lunar calendar.
"Twenty-four solar terms" is the product of ancient agricultural civilization and occupies an extremely important position in Chinese traditional agricultural society. Agricultural production is closely related to the rhythm of nature. It is a knowledge system formed by ancient ancestors who observed the movement of celestial bodies in agricultural time and realized the changing laws of one year, climate and phenology. Scientifically reveals the law of astronomical and meteorological changes, skillfully combines astronomy, agriculture, phenology and folk customs, and derives a large number of related seasonal cultures.
The above contents refer to Baidu Encyclopedia-beginning of spring Baidu Encyclopedia-Solar Terms.