Beginning of winter's climax in Travel Notes of the Moon

Beginning of winter is one of the 24 solar terms in the lunar calendar and one of the traditional festivals in China. The time point is between the Gregorian calendar165438+1October 7-8, that is, the sun is located at 225. At this time, the earth is located at declination-16 19', and the noon sun height in Beijing is only 33 47'. After beginning of winter, the sunshine time will continue to shorten, and the height of the sun will continue to decrease at noon. During beginning of winter's period, the Han people took beginning of winter as beginning of winter, so it was necessary to supplement the dietary customs in order to survive the severe winter.

Li also means that winter begins. Winter means the end, which means that the crops should be harvested after harvest. China regards beginning of winter as the beginning of winter.

Beginning of winter solar terms and high-altitude westerly jet have been fully established in South Asia. At this time, the fluctuation of the south branch of the high-altitude westerly wind and its eastward movement have great influence on the precipitation weather in Jianghuai area. When the zonal circulation in Asia and the fluctuation of the south branch of the westerly wind are strong, there will be a wide range of rainy weather. In addition, the zonal circulation will end, the meridional circulation will be established, and there will be a cold wave and significant cooling.

Before and after winter, precipitation in most parts of China decreased significantly. The land in northern China is frozen, and agricultural and forestry crops have entered the wintering period. The "Sanqiu" in the Jianghuai region of China is drawing to a close, but the southern region of China needs to quickly plant late-season winter wheat and transplant rape, and the southern region is the best time to plant wheat. In addition, after winter, the air generally becomes dry and the soil water content decreases. At this time, China began to pay attention to the fire prevention work in forest areas.