What are the meanings of "slight cold" and "great cold" in the 24 solar terms?

Slight cold, the 23rd solar term in the 24 solar terms of the lunar calendar, is also the fifth solar term in winter, marking the official start of the season and winter. When the sun reaches the longitude of 285 (slight cold), it marks the arrival of the coldest day of the year in China.

Great cold is the last solar term of slight cold. It is the last of the 24 solar terms in the whole year. Every year around 65438+1October 20th in Gregorian calendar, when the sun reaches 300, it is a severe cold.

Ancient records:

Slight cold, December festival. The cold was still small at the beginning of the month, so it was cloudy. Half a month old.

Great cold is the middle, and the upper form is slight cold, so it is called great cold ... the inverse pole of cold, so it is called great cold.