1. Eat jiaozi on the winter solstice.

2. The Winter Solstice, also known as Solstice, Winter Festival and Asian New Year, has both natural and humanistic connotations. It is not only an important solar term among the 24 solar terms, but also a traditional folk festival of ancestor worship in China. The winter solstice is one of the four seasons and eight festivals, which is regarded as a big holiday in winter. In ancient times, there was a saying that the winter solstice was as big as a year. In the northern part of China, it is a custom to eat jiaozi every winter solstice.

3. The winter solstice is the 22nd solar term of the "Twenty-four Solar Terms", with the solar meridian reaching 27, and it is celebrated on December 21-23 of the Gregorian calendar every year. The winter solstice is the extreme point where the direct sunlight travels southward. On the winter solstice, the sun shines directly on the Tropic of Capricorn, and the sun is the most inclined to the northern hemisphere, and the solar altitude angle is the smallest. It is the shortest day and the longest night in all parts of the northern hemisphere. The winter solstice is also a turning point for the direct sunlight to return to the north. After this day, it will go back, and the direct sunlight will start to move northward from the Tropic of Capricorn (23 26' s), and the daylight in the northern hemisphere (China is located in the northern hemisphere) will increase day by day.