Where does the great cold come from in spring?

"After 30 days in beginning of winter, it will be very cold on the solstice." According to the China astronomical calendar, the last of the 24 solar terms, the Great Cold Solar Term, will be ushered in at Beijing time1October 20th 165438. The great cold is an important turning point in the transformation of yin and yang in a year. Winter goes and spring comes. "Extreme cold is called great cold."

As the saying goes, "beginning of spring after the Great Cold", after the Great Cold, the solar cycle of the new year is coming.

The ancients thought that "Great Cold" was the coldest day in a year, colder than slight cold, but in fact this cognition was not accurate. According to the data, since meteorological records were recorded in China in 195 1, 42% of the years were mild cold, and only 28% were severe cold. But even so, we cannot underestimate it. As the saying goes, "it's freezing in the cold, freezing into a ball." In the severe cold season, strong winds, low temperature, rain and snow frequently patronize, and the cold wave goes south, which is easy to form disastrous weather, and the snow on the ground does not melt, showing a cold scene of ice and snow freezing.