What is the meaning of the great cold solar terms, and the characteristics and customs of the great cold solar terms are briefly introduced
The meaning of severe cold solar terms
Great cold, as the name implies, is the extreme cold weather. "Time-sharing, Time-sharing, Time-sharing" quoted "Three Rites and Righteousness": "Great cold is the middle one, and it is shaped by slight cold, so it is called great … the extreme of cold, so it is called great cold."
Great cold is a solar term reflecting the process and degree of temperature rise and fall. Originally, the sun shines directly on the Tropic of Capricorn during the winter solstice, which is located in the northern hemisphere of China. The daytime is the shortest, and the night is the longest. The ground receives the least light and heat, and the weather should be the coldest. However, the actual cooling is during the slight cold and severe cold festival after the winter solstice, which is called "cold in March 9".
Characteristics of severe cold solar terms
In severe cold season, the average temperature in most parts of southern China is 6℃ to 8℃, which is nearly 1℃ higher than slight cold. The proverb "slight cold and severe cold, cold in a ball" shows that the severe cold solar term is also a cold period of the year.
During the severe cold solar term, the rainfall in most parts of southern China only increased slightly compared with the previous period, with 5-1 0mm in most parts of southern China and only1-5mm in the mountainous areas of northwest plateau. During the period of dry winter and overwintering in South China, the water consumption is small, and the contradiction between water supply and demand in farmland is generally not prominent. However, "don't complain about the rain and snow when you are bitter and cold, and the snow will be left to the wheat next year." In the case of scarce rain and snow, timely watering in different areas according to different farming habits and conditions is undoubtedly of great benefit to the growth of wheat crops.