Why is the slight cold winter solar term of 202 1 colder?
What is the small winter of 202 1? The fifth slight cold is the 23rd solar term among the 24 solar terms and the fifth solar term in winter. It is also the end of the calendar month and the beginning of the ugly month; The time point is between 65438+1October 5-7, and the sun is at 285. Slight cold, like severe cold, mild summer heat, slight cold, snowy day and severe summer heat, are all solar terms indicating temperature changes. For China, the slight cold represents the beginning of the coldest day of the year. "Twenty-four solar terms" says that "the cold is still small at the beginning of the month ... it is big at half a month", that is to say, in the Yellow River basin, the cold at that time was colder than the slight cold. And because the slight cold is still in the last few days of February 9, it takes several days for the slight cold to enter March 9, and the slight cold in winter corresponds to the slight heat in summer. As the saying goes, cold air has been cold for a long time. At this time, the weather is cold, and the great cold is not extreme, so it is called slight cold.
Why is the slight cold colder? In the last solar term "winter solstice", the ground gets the least solar heat, but there is still some heat in the deep soil that can be emitted upwards, so the winter solstice is not the coldest time of the year. In the slight cold, the heat in the deep soil is lost to the lowest point. Although the days are slightly longer and the amount of light and heat of the sun is slightly increased, it is actually the most difficult time to make ends meet, so it becomes the coldest season all year round. From the winter solstice, the "99" and "39" with cold weather are the coldest periods, and they always fall within the slight cold solar terms. There is an anonymous saying in Song Ci, "Clouds and dusk are the same in the slight cold season, and the wind is fierce" ("Looking at Mei"), which is exactly the cold of the slight cold.
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