What are the short stories about the origin of the vernal equinox and solar terms?

Among them, the custom of "beating spring cattle" is popular all over the country, and its ceremony is carried out by various counties. "County Records" records: "Before beginning of spring, there was a meeting in the eastern suburbs to welcome the God of Ju Mang, and all the cities in the city performed stories, saying that it was the year of Qingfeng. The people, men and women, took their children to watch the spring, and the local Niu Yi sprinkled beans and hemp. It is said that the acne disappeared. Beginning of spring worships the sacred mountain of the sun, whips the earth and cattle, and the people fight for clods to release the animals' pens, so as to save the animals' interest. ?

It was the day before yesterday, during the beginning of spring season, the local ox was placed outside the east gate of the county for the first time, and a dummy with farm tools and whips was set up next to it as a "cultivator" to show that spring has come and farming is ready. At the beginning of spring, the government will offer offerings to Mang Shen and Tu Niu, and hold a grand ceremony of "beating cattle" at noon.

Officials beat drums, and officials beat local cows three times with red and green whips or willow branches, and then handed them over to subordinates and farmers for beating in turn. Playing the bull's head in spring symbolizes auspiciousness, playing the ox's waist in spring symbolizes bumper harvest of crops, and playing the ox's tail in spring symbolizes peace in the four seasons. Whipping spring cattle anywhere symbolizes the beginning of spring ploughing to drive away the cold. The worse the local cattle are, the better.