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Count the natural law of the first nine in cold days

DailyBird Culture 2021-10-09 1 0

counting nine cold days in our life, if we look at it from the surface meaning, it must refer to some changes in the weather. Then what time point will the first nine of counting nine cold days start from? Because we know its starting time, we can make corresponding preparations for our next series of living areas.

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which day is the first day of counting nine cold days

counting nine cold days starts on the first union day of the winter solstice monkey, which is the first day of counting nine cold days, that is, the first day of nineteen, which belongs to the solar terms of the winter solstice.

means counting nine cold days.

means counting nine cold days in the folk. It refers to the coldest day in winter, usually during the "March 9th and April 9th" periods. This is mainly because the total ground heat budget deficit reached its maximum in the "April 9" season. The heat storage in the northern hemisphere is the least in a year, so it is the coldest. In addition, the cold air mass in Siberia also developed to an extremely strong stage during this period, and the strong cold air invaded frequently, which is also the reason why the temperature is very low.

the natural law of nine cold days

generally speaking, the coldest period of time in China's winter usually occurs after the winter solstice. After the beginning of winter, it means entering winter, which does not mean starting to be cold. Therefore, the heat stored on the surface in the second half of the year still has some energy, so it is not very cold. There is a saying among the people that "October little sunny spring" refers to the sunny, warm and comfortable "little sunny spring" weather during Mengdong. Therefore, in fact, it is generally not very cold in early winter (Mengdong), but with the passage of time, the cold air frequently goes south and the temperature gradually decreases. During the winter solstice, the day is the shortest, the angle between the direct sunlight angle and the ground is the smallest, and the sunshine intensity received by the ground per unit area is the smallest. Therefore, the ground receives the least solar heat every day, and the daily heat budget deficit has not reached the maximum. After the winter solstice, although the daytime increases 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 sunlight angle and the ground increases very slowly. The daily heat budget of the ground is still in deficit, so it continues to lose heat and the ground temperature continues to decline. It's also coming to the coldest time of the year.

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