1, meaning of winter solstice: On this day of winter solstice, the sun moves to longitude 270 (winter solstice), and the position where the sun directly hits the ground reaches the southernmost point of the year. The sun is almost direct to the Tropic of Capricorn (also known as the winter solstice daily line), and the sun is most biased towards the northern hemisphere. Therefore, the winter solstice is the shortest day and the longest night in the northern hemisphere. The shorter the day, the longer the night. The winter solstice is the southernmost day of the sun in a year, and it is also the limit of the sun's southward travel.

2. Climatic characteristics: Astronomy regards the winter solstice as the beginning of the cold winter climate, which is obviously late for most parts of China. The winter solstice is the shortest day of the year in the northern hemisphere. After the winter solstice, the direct point of the sun gradually moved northward, the days in the northern hemisphere began to get longer and the height of the sun gradually increased at noon.

Therefore, there is a saying, "Eating noodles on the solstice in winter will make the day longer." From winter to the future, although the solar altitude angle gradually increases, it is a slow recovery process, and the heat lost every day is still greater than the heat received, showing a situation of "making ends meet". In the "three or nine days", the accumulated heat is the least, the temperature is the lowest, and the weather is getting colder and colder. If there is the influence of cold air at this time, the weather will be even colder. After this "cold front", the weather will gradually get warmer.

3. Local customs: jiaozi is widely eaten in the north, such as Chaoshan glutinous rice balls, Southeast hemp seeds, Taizhou Yuan Lei, Hefei pumpkin pie, Ningbo sweet potato Tang Guo, Tengzhou mutton soup, Jiangnan rice, Suzhou brew, etc.

It should be noted that winter solstice is one of the most important solar terms in health preservation, mainly because "winter solstice is a sunny day". Slight cold and severe cold are the coldest seasons in winter solstice. People with heart disease and high blood pressure often get worse, and the number of people suffering from "stroke" increases, and it is easy to get frostbite in cold weather. Pay attention to cold and warmth, adjust diet and daily life reasonably, and do not drink, smoke or overwork.

Keep a good mood, be stable and happy, and avoid anger, impatience and depression. Proper exercise to keep out the cold and proper tonic.