People began to celebrate the winter solstice as early as 2500 years ago in the Spring and Autumn Period. According to records, the Zhou and Qin Dynasties took November as the first month and the winter solstice as the beginning of the year. In other words, people celebrate the New Year on this day. The ancients believed that since the winter solstice, the sun be the spirit of heaven and earth began to flourish, that is, the next cycle began, which was the "day of good luck." There is also a saying that the winter solstice originated from the Han Dynasty as a festival. The winter solstice is a "winter festival", so it is regarded as a big festival, and there is a saying that "the winter solstice is as big as a year".
On the winter solstice, although the sun is low and the day is short, the temperature of the winter solstice is not the lowest in meteorology. In fact, because there is still "accumulated heat" on the surface, it is usually not very cold before the winter solstice, and the real cold is after the winter solstice. Because of the great difference in climate in different parts of China, this climatic winter is obviously late for most parts of China. The winter solstice marks the beginning of the cold season, and the people begin to count nine to calculate the cold days.
Meteorological changes in the winter solstice:
After the winter solstice, although the solar altitude angle gradually increased, it was a slow recovery process, and the heat lost every day was still greater than the heat received, showing a situation of "making ends meet". On the "March 9, April 9", the accumulated heat is the least, the temperature is the lowest, and the weather is getting colder and colder. China has a vast territory, and the climate and landscape vary greatly from place to place.
Although the day of the winter solstice is short, the temperature of the winter solstice is not the lowest; It won't be very cold before the winter solstice, because there is still "accumulated heat" on the surface, and the real cold winter is after the winter solstice. Because of the great disparity of climate in different parts of China, this astronomical climate feature is obviously late for most parts of China. After the winter solstice, the climate in all parts of China will enter a coldest stage, that is, people often say "it's cold in the ninth year" and "it's cold in the ninth year".