Moral of the winter solstice: On this day of the winter solstice, the sun shines almost directly on the tropic of Capricorn. Our northern hemisphere has the shortest day and the longest night, and it has begun to enter several cold days. Astronomy stipulates that this day is the beginning of winter in the northern hemisphere. After the winter solstice, the direct sunlight gradually moved northward, and the days in the northern hemisphere gradually became longer. As the proverb goes, eating noodles on the winter solstice makes a day grow longer.

Taboo: After the winter solstice, the white is getting longer and longer, and the sun is the spirit, so you must rest in peace and rest. Therefore, there is a saying that you should not travel during the winter solstice, while in Henan, you should avoid eating jiaozi during the winter solstice, otherwise your ears will be frozen, which will be detrimental to agricultural harvest. The proverb says: "The winter solstice is not winter (meaning not eating jiaozi), and there is no positive wind in the field." There is no rain in Hubei. The proverb says: "beginning of winter sees the winter solstice without rain, and the winter solstice has no rain-it's sunny in winter." It means that there will be a severe drought in the coming year.

Extended data:

According to legend, more than 3,000 years ago, the Central Plains of China began to use the Tugui method (the standard table) to measure the shadow, and the position in the world was measured in Luoyi, Henan Province, which was designated as the soil. The "Winter Solstice" established by the standard chart mapping was the first one in 24 solar terms which was determined by the Duke of Zhou, and it was regarded as the first of the 24 solar terms.

The essence of the method of "Tugui surveying shadow" is that "the tree is eight feet tall, and on the summer solstice, the length of the scene is five inches (equivalent to the absence of poles on the Tropic of Cancer); On the winter solstice, the scenery is one foot, three feet and five inches long "(that is, a benchmark with a height of eight feet is erected. When observed on the summer solstice, the shadow at noon is 1.5 feet, and the shadow at noon on the winter solstice is 13.5 feet)," The depth of the soil is measured, the shadow is positive, and it is in the middle of the ground, and it is tested at four o'clock ".

It is said in Shangshu Luogu that the Duke of Zhou "looked forward to Luoshi" and made an investigation in several places around Luoyang, and finally determined that Jianshui East, Zhuoshui West and Zhuoshui East are all "only Luo food" (all good places to build a ancestral temple state). The story of Duke Zhou's selection of Luoyi's base site through "Tugui mapping" was recorded in ancient books and was regarded by later generations as the method of sealing the country and building the country.