2, the custom of winter solstice: ancestor worship and banquet.
3. The origin of the winter solstice: It is said that the solar terms of the winter solstice were first measured by the Duke of Zhou by the method of soil return. As early as 3000 years ago, Duke Zhou began to measure the shadow by the method of soil return, and its position in the world was measured in Luoyi, Henan Province, and it was designated as soil. According to legend, "winter" is the earliest one measured by Duke Zhou in the 24 solar terms (time average method), so there is a saying that "winter is the first of the 24 solar terms".