What are the four solar terms of winter snow and winter?
A sentence about solar terms in the Song Dynasty is: Spring rains shake the valley in spring, summer is full and summer is hot, autumn is cold and frost falls, and winter is snowy.
The first four sentences of the solar term song are composed of one word in each solar term in order.
Twenty-four solar terms are a knowledge system formed by ancient ancestors following the agricultural season and understanding the laws of natural rhythm by observing the movement of celestial bodies, including six solar terms in spring, summer, autumn and winter.