When is the coldest count to nine? Three nine six nine or nine nine?

Jiujiu, also known as Winter Jiujiu, is a traditional folk solar term in China with a long history. At nine o'clock, it's already winter. With the advance of nine o'clock, the weather is getting colder and warmer, and finally winter is coming. So it's coldest when you count to nine? Let's have a look.

Q: When is it coldest?

A: Nine is the coldest on March 9th.

There is a folk saying that "it's cold in nine days, and it's cold in dog days", and "dog days" refers to the third "nine days" after the winter solstice, that is, the 19th to 27th days after the winter solstice. "Yanjing Age" said: "The winter solstice on March 9 is difficult." It means that it has entered the coldest stage in cold weather since March 9. So in winter, 3949 is the coldest stage, just close to the great cold in the twenty-four solar terms. Every year around 65438+1October 20th, there is a severe cold, which means the weather is extremely cold.

So why is "Sanjiu" the coldest? The scientific explanation is as follows:

During the winter solstice, the daytime is the shortest, the angle of direct sunlight on the ground is the smallest, and the sunshine intensity per unit area on the ground is also the smallest, so the ground gets the least solar heat every day, and the daily heat budget deficit on the ground has not reached the maximum. On the solstice after winter, although the day is growing day by day, the growth rate is very slow. From the winter solstice to the "March 9" period, the average daily growth is only about one minute.

At the same time, the angle between the direct angle of the sun and the ground slowly increases, and the daily heat budget of the ground is still in a deficit state, so the heat is continuously lost and the ground temperature continues to drop. The deficit of total heat balance on the ground only reaches the maximum in the season of March 9. Because the temperature is mainly affected by the ground temperature, it leads to the lowest temperature in March 9 (of course, this is not the case all over the country, but every year, depending on the region and age). In addition, around March 9, the cold air mass in Siberia also developed to a very strong stage, and the frequent invasion of strong cold air is also one of the reasons for the low temperature.

The earth absorbs heat from solar radiation during the day and releases heat at night. In summer, you absorb more heat during the day and emit less heat at night, so you can accumulate some heat every day. In winter, less heat is absorbed during the day and more heat is released at night. Not only can you not accumulate it every day, but you also need to use some of the heat accumulated in summer. During the winter solstice, less heat is absorbed during the day, but there is still some stored heat on the earth. After the winter solstice, less and less heat is stored. By March 9, the earth's heat storage is the least in a year, so it is the coldest.

Conclusion: March 9 is the coldest time of the year. At this time, people, especially middle-aged and old friends, should remember to keep warm. At the same time, potential vitality and hidden yang are the best opportunities to maintain and accumulate energy. It is necessary to pay attention to the combination of nourishing and nourishing, which can not only increase nutrition, but also dispel cold and strengthen the body.