What is the origin of light snow solar terms?

Among the 24 solar terms, the 20th solar term is Xiaoxue, which is also the solar term after beginning of winter and the second solar term in winter. In winter, the weather is getting colder and colder, so what are the weather characteristics of the light snow solar term? What is the origin of light snow solar terms? Next, let's take a look at this issue of the old almanac!

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Characteristics of light snow solar terms Many areas in the middle and lower reaches of the Yangtze River have entered winter one after another. Beginning of winter solar terms in northern China have basically entered winter. In the light snow solar term, many areas in the middle and lower reaches of the Yangtze River have entered the winter one after another. Although with the arrival of winter, the precipitation in the whole country has gradually dropped to the lowest point in a year, the rainfall in Jiangnan is still higher than that in Jiangbei. Even if the first snow only appeared in the middle and late June of 65438+February in this area, the rainy weather at this time gave people a feeling of wet and cold rather than cool in late autumn, which was much worse than that of people with heating conditions in dry and cold areas in the north.

The temperature continues to drop. During the solar term in beginning of winter, there is snow in most parts of northwest and northeast China. In the light snow solar term, it means that there will be snow in North China. If the beginning of winter solar term marks the entry of winter in most parts of northern China, the direct performance of cold air is to gradually make the temperature in these areas reach below 0℃ in the light snow solar term. We all know that precipitation will change from rain to snow only when the air temperature under clouds and clouds is lower than 0℃. Therefore, it is an indisputable fact that the temperature in light snow stage is lower than that in winter stage.

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According to the understanding and explanation of modern science, the origin of Xiaoxue solar term is called Xiaoxue solar term, which begins in October of the lunar calendar, around Gregorian calendar165438+1October 22, and the sun reaches 240 degrees of the yellow meridian. In other words, the natural phenomenon "snow" is also prominent in reflecting the regularity of solar terms, that is, after the annual "beginning of winter" solar terms, the snow season begins in October of the lunar calendar and November of the solar calendar, and the snowfall is divided into different sizes. It is called "light snow" when the snowfall is small after winter every year.

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In fact, China's meteorological regulations: (1) When it snows, the horizontal visual distance is more than 1000 meters; (2) Snow less than or equal to 2.5 mm within 24 hours is called "light snow". According to the convention of ancient social life, people's understanding and explanation of "snow" is called "October" from lunar calendar 1 month to winter every year. The rain was thinned by the cold again, so it condensed into snow. Small words are not prosperous. Therefore, since ancient times, people's understanding and explanation, closely combined with the needs of agriculture, have been summarized as "light snow" and included in the "twenty-four solar terms", which is called "light snow" as the solar term after "beginning of winter". Wu Cheng, a scholar in Song and Yuan Dynasties, said in "Twenty-four Solar Terms" that every winter after beginning of winter on October 15th of the lunar calendar, bucket handle refers to the sea as a light snow. In mid-October, the rain was thin because of the cold, so it condensed into snow. Xiao Yi's words are not prosperous. After a while, the rainbow disappeared. Note in the Book of Rites: Yin and Yang meet to form a rainbow. ""At this time, Yin and Yang are extremely divided, so the rainbow falls. Rainbow is said to be hidden without quality, that is, hidden under the breath. Second, the weather is rising, and third, the atmosphere is falling and blocked, turning into winter. Heaven and earth are in their proper places. Not until we meet. If they don't work, they will be blocked. The reason is winter. "

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