The beginning of the relationship between Tianshui and autumn and winter in Qing Dynasty indicates that the season has arrived.

The clear phase of Tianshui and the beginning of autumn and winter indicate the arrival of beginning of winter.

In ancient times, people used to regard beginning of winter as the beginning of winter. At this time, the north wind started, the ground began to freeze, and the water began to freeze, which was also "sunny". Beginning of winter is the19th solar term among the 24 solar terms. The ancient people's understanding of "ceremony" is the same as that of modern people, both of which mean establishment and beginning. But the word "winter" is not so simple. In the ancient book "Twenty-four solar terms", the explanation of "winter" is: "Winter is the end, everything is harvested", which means that all the crops in autumn are harvested and put into storage, and all the animals are hiding and hibernating. It seems that beginning of winter not only represents the coming of winter, but completely speaking, beginning of winter means the beginning of winter, and everything is collected to avoid the cold.