What are the solar terms of the frozen silver bed in front of the steps and the ice stalactites in the eaves?

The frozen silver bed in front of the steps and the ice stalactites on the eaves are all talking about the great cold solar terms.

Great cold refers to extremely cold weather. The Great Cold is the last of the twenty-four solar terms, and it is called "Great Cold" when the sun reaches 300 degrees of the yellow meridian around 65438+1October 20th every year. Great cold is a solar term that reflects the process and degree of temperature rise and fall. Great cold is colder than slight cold, and it is the coldest season in a year. Cui Lingen in the Liang Dynasty wrote "Three Rites and Righteousness": "Extreme cold is called great cold."

Meteorological change

During the severe cold solar term, the atmospheric circulation is relatively stable, and the adjustment period of circulation is about 20 days. When this circulation is adjusted, there will often be a wide range of rain and snow weather and strong winds to cool down. When the west of 80 degrees east longitude is a long wave ridge and East Asia is a coastal trough, under the influence of northwest wind and constantly supplemented cold air, China will have a sustained low temperature. Like slight cold, great cold is also a solar term indicating the degree of cold weather.

According to the statistics of perennial climate data in China, the coldest period of a year in northern China is 65438+ 10 in mid-June (June 1 1-20).

The annual slight cold solar term starts from 65438+1October 5-7, one solar term is about 15 days, and the middle section is just within the slight cold solar term; So for most parts of the north, slight cold is indeed colder than severe cold. But for most parts of the south, it is the coldest in the great cold solar terms; The severe cold solar term in the south generally starts from 65438+1October 20th, and the end of 65438+1October is the coldest time of the year in the south.