1, the winter solstice is the 22nd solar term among the 24 solar terms in China, when the sun reaches 270 degrees of the yellow meridian. "Zunxian Manuscript" records: "When the cathode arrives, the sun begins to grow, the sun goes south, and the days are short and the shadows are long, so it is called the winter solstice." On the solstice of winter, the sun shines directly on the tropic of Capricorn, and the day is the shortest and the night is the longest in the northern hemisphere. As early as more than 2,500 years ago in the Spring and Autumn Period, China had observed the sun with the earth, and determined the winter solstice, which was the earliest of the 24 solar terms, and the time was from 0 to 23 in Gregorian calendar 65438+February 265438.

In all parts of the northern hemisphere, the winter solstice is the shortest day in a year, and the farther north, the shorter the day. North of the Arctic Circle, the sun is below the horizon all day, which is the widest day of the year in the northern hemisphere. For the rest of the northern hemisphere, the winter solstice is also the lowest day at noon in a year.

3. The solar terms from the winter solstice are very cold, outdoor activities have been less, and people spend more time at home. The solstice in winter has become a holiday for visiting relatives and friends. In the "fat winter and thin year", in the folk, winter festivals are also held to celebrate and worship winter, such as gathering fires at the winter solstice festival in November of the lunar calendar, worshipping family temples, parents and elders, and holding family banquets to congratulate relatives. The custom of eating jiaozi on the solstice in winter is widely spread among the people.

4. From the perspective of TCM theory, the winter solstice is the time when Yin Qi rises and falls, and when Yang Qi begins to sprout, Yin and Yang transform, which constitutes the balance and harmony between nature and human body in sports, and health preservation should also conform to this law. Don't eat too spicy food on the solstice of winter. Eating too spicy can only lead to the accumulation of internal heat, which will persist. First of all, we should wear more clothes, avoid cold and evil, and pay special attention to the warmth of our feet.