If you don't understand, ask, why is the winter solstice the highest among the 24 solar terms?

The winter solstice is the earliest of the 24 solar terms.

As early as more than 3000 years ago, Duke Zhou began to use the method of returning to the earth to measure shadows, and used the method of returning to the earth to "show the world" where Luoyang was located, and then began to divine the land of the country. After the nation-state (capital and ancestral temple) was built, Duke Zhou formulated the national etiquette system in detail in the Rites and Music System of Chengzhou Tang Ming. According to records, the first month of the Zhou Dynasty is winter and November, and the first year of the New Year is the winter solstice. In other words, Duke Zhou chose the longest day of the year calculated by Tuguifa as the day when the New Year began.

From meditation to Qin dynasty, winter is always the same as the beginning of the year. This is still the case in the Han Dynasty. There is a saying in Hanshu: "The sun shines on the winter solstice, so congratulations ..." In other words, people originally celebrated the winter solstice to celebrate the arrival of the New Year.

The ancients believed that since the winter solstice, the yang of heaven and earth began to flourish and become stronger, representing the beginning of the next cycle, which is a good day. Therefore, later, during the Spring Festival, customs such as ancestor worship and family dinners often appeared on the winter solstice. The winter solstice is also called "off-year". First, it shows that the year is approaching and there are not many days left. The second is to show the importance of the winter solstice. As a festival, the winter solstice originated in the Han Dynasty, flourished in the Tang and Song Dynasties, and has continued to this day.