How did the great cold solar terms come from?

The year 2020 is coming to an end, but the lunar year 2020 is not over yet. Although there are no holidays in the lunar calendar in 2020, there are two more important solar terms in winter, namely slight cold and severe cold. Among them, the Great Cold is the last of the 24 solar terms, which means the coldest time in winter. However, how did the great cold solar terms come from? Let's have a look!

The origin of the great cold solar terms

Wu Cheng's book "Twenty-four Solar Terms" in the Yuan Dynasty said: "See you in the middle of December (slight cold)." Time-sharing, time-sharing, time-sharing and time-sharing have three meanings: "Great cold is the middle and shaped by slight cold, so it is called great ... extremely cold, so it is called great cold."

The Great Cold is the last of the 24 solar terms. Fighting refers to ugliness; The longitude of the sun is 300; Gregorian calendar 65438+1October 20th -2 1. Great cold, like slight cold, is also a solar term indicating the cold weather. Great cold is the coldest solar term in a year.

The severe cold solar term, when cold waves frequently go south, is the cold period of the year, with strong wind and low temperature. In some parts of China, severe cold is not as cold as slight cold, but in the southern coastal areas of China, the lowest temperature will still appear in the severe cold solar terms. Slight cold and severe cold are the periods with the least precipitation in a year.

The ancients especially talked about "extremes meet" and thought that the "day" of alternating cold and summer was to recover quickly after a cold. If you have a bad cold first, and then a slight cold, then you can't feel "recovered" after the coldest, so just leave the bad cold behind and let it go back to beginning of spring, which is in line with the principle of "extremes meet".

There is also a saying that the slight cold in winter corresponds to the "slight heat" in summer, so it is called "slight cold"; The severe cold in winter just corresponds to the "great summer heat" in summer, so it is called "great cold"