When did the 99 solar term start?

99 refers to the time of year from colder to coldest to warmer. It starts with the winter solstice as 99, that is, from the day of 65438+February, 2 1 or 22, and counts 99, 29, and 39 every 9 days in turn ... until two or three days before the shock.

Jiujiu, also called Jiujiu in winter, is a folk method in China to calculate the flowering date in cold weather and warm spring. Generally speaking, March 9 and April 9 are the coldest times of the year. After counting to nine days, spring is deep and warm, and everything is full of vitality. It's time for spring ploughing.

The number nine method is passed down from mouth to mouth among the people in our country, which has a history and lacks records. As for when it originated, there is no exact information. In traditional culture, nine is the extreme number, the most positive number and the largest number. The accumulation of the most positive number means that Yin Qi is decreasing day by day until the end of nine o'clock, which means that cold comes to warm up and spring returns to the earth.