The Great Cold is the last of the 24 solar terms. Fighting refers to ugliness; The solar longitude is 300; Gregorian calendar 1 month 20-21day. Great cold, like slight cold, is also a solar term indicating the degree of cold weather. Great cold is the coldest solar term in a year. According to the long-term meteorological records in China, there is no slight cold in the great cold solar terms in the northern region; However, for most areas in the south, it was the coldest in April and September, so the big cold solar terms were colder than the small cold solar terms.

Extended data:

The Great Cold is the last of the 24 solar terms. It is called "Great Cold" when the sun reaches 300 degrees of the Yellow Meridian around the 20th of Gregorian calendar 1 month, and it is in the period of March 9th and April 9th. At this time, cold waves frequently go south, which is the coldest period of the year. As the folk saying goes, "A slight cold is severe, and there is no wind and it is cold."

Great cold means extreme cold weather. Although the oblique sunlight in the northern hemisphere is the most severe during the winter solstice solar terms, the coldest time of the year is the slight cold and severe cold solar terms after the winter solstice solar terms, especially the severe cold solar terms; This is because after the winter solstice, the direct point of sunlight will gradually move northward, but in the following period, the direct point of sunlight will always be in the southern hemisphere, and the heat in the northern hemisphere will always be lost. The heat absorbed during the day is still less than the heat released at night. Therefore, after the winter solstice, the temperature in the northern hemisphere will continue to decrease, reaching its lowest point in the severe cold solar term, and the severe cold will become the coldest solar term in a year.