According to the Astronomical Calendar of China, the "Winter Solstice" solar term will be ushered in at 8: 02 Beijing time1February 2/day/kloc-0. From this day on, China began to enter the "cold weather" season, which is commonly known as "entering the ninth".

Luo Shuwei, a historian and researcher at Tianjin Academy of Social Sciences, said that the annual Gregorian calendar1February 22nd is the "winter solstice", which is the 22nd solar term among the 24 solar terms and the fourth solar term in winter. Contrary to the corresponding "summer solstice", on the "winter solstice", the sun shines almost directly on the tropic of Capricorn, which is the shortest day and the longest night in the northern hemisphere. It is called "short day" or "short day" in ancient times. After the "winter solstice", the direct point of the sun slowly moved northward, and the days in the northern hemisphere gradually became longer and the nights gradually shortened.

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The "Winter Solstice" is the key moment for the transformation of Yin and Yang in a year. When the Yin qi declines, the Yang qi rises, and the underground spring water begins to sprout, which is a sign that winter is gone and spring is coming. However, in the astronomical sense, the "winter solstice" means that the severe winter should come in time. This is because from the "winter solstice", the ground in the northern hemisphere lost more heat than it absorbed. Before and after the "March 9th", the heat accumulated on the ground dropped to the minimum, and the weather was coldest. Therefore, there are sayings of "Don't shoot in 1929, walk on the ice in 3949" and "Cold in March 9th".

References:

People's Daily Online -2 1 Day 18: 02 "Winter Solstice": The overcast day lasts until the sun, and the sun returns from the ground.