China has entered the "nine cold" from winter solstice, so pay attention to keep warm and prevent diseases. Xinhuanet Tianjin 65438+February 20 (Reporter Zhou Runjian) 65438+February 22 will usher in the "winter solstice" in the 24 solar terms of the lunar calendar. Experts remind that China has entered the cold weather that lasts for several days since the winter of November. At this time, the public should prevent the invasion of cold climate, pay attention to keep warm and cold, and have fewer diseases. Method of keeping in good health in winter: In order to keep warm and avoid diseases, Li Yanling, director of the Nutrition Department of the First Affiliated Hospital of Tianjin University of Traditional Chinese Medicine, suggested that citizens should add clothes in time according to the weather conditions on this festival. Clothes and trousers should be warm, soft and loose, and should not be worn too tightly to facilitate blood flow. As the saying goes: "Move in winter and get sick less." "Lazy in winter, drink more medicine." Therefore, it is necessary to carry out appropriate cold-proof exercise and physical exercise at this time. For example, washing your face with cold water, jogging, boxing, sword dancing, etc. can all improve your body's adaptability to cold and cold tolerance. What to eat in winter solstice: In addition to wearing more clothes and strengthening physical exercise, you should also eat more cold-proof foods in your daily diet, such as kelp, seaweed, spinach, Chinese cabbage, corn, lotus root, carrot, sweet potato, lily, mutton and beef, which can improve your body's cold-proof ability. Zhao Zhi Heng, an expert in astronomy education in China, said that the winter solstice of the Gregorian calendar is around 65438+February 22nd every year. At this time, the longitude of the sun is 270 degrees, and the sun is almost directly on the tropic of Capricorn. Solar radiation and sunshine hours reach the lowest point, with the shortest day and the longest night in the northern hemisphere. Therefore, the winter solstice is also called "short day" and "short day" in China. After the solstice in winter, the days will get longer day by day. Su Wen's theory of pulse to subtlety says: "On the forty-fifth day of the winter solstice, the yang is slightly higher and the yin is slightly lower." It means that in the 45 days from this day to beginning of spring, the yang gradually rises, the yin gradually declines, the days gradually lengthen and the nights gradually shorten. Astronomical experts say that after the winter solstice, the climate in China has entered the coldest stage, which is often called "the ninth year". There is a folk proverb in China, "It's cold in March, but it's hot in dog days". According to the statistics of meteorological data, there are strong cold air and cold current going south every winter, which leads to a sudden drop in temperature, accompanied by strong wind, rain, snow, freezing and other bad weather.