When is the coldest time of the year?

The coldest time of the year is 39 to 49 days.

The coldest time of the year is from March 9 to April 9, and March 9 and April 9 are about 18 to 27 days from winter to the future, that is, from the beginning of 1 month to the end of 1 month. At this time, the coldest weather is mainly caused by the daily heat budget deficit on the ground, and some friends should know that the direct sunlight area received by the ground in the northern hemisphere is the smallest from winter to day, and the solar heat obtained at this time is also the least.

With the passage of time, the ground temperature continued to drop, and by 3949, the budget deficit of ground heat in the northern hemisphere reached the maximum. Coupled with the influence of the Siberian cold current, it naturally became the coldest time of the year.

Introduction of the number nine

Jiujiu, also called Jiujiu in winter, is a folk method to calculate the date of warm flowers in spring and cold days in China. Generally, March and April are the coldest time, which is the coldest time of the year. When you count to nine "nine days" (998 1 day), spring will be deep and warm, and everything will be full of vitality. It's time for spring ploughing.

Law No.9 is passed down from mouth to mouth among the people in our country, which has a history but lacks records. As for when it originated, there is no exact information. In traditional culture, nine is the extreme number, the "highest yang" number and the largest number. The accumulation of "Zhiyang" means that Yin Qi is decreasing day by day, and it is tired to the end, which means that the cold is getting warmer and "the spring is deep".

The above content is quoted from Baidu Encyclopedia-the number nine.