What does the solstice winter have to do with?

Summer solstice. Winter solstice is the fourth solar term in winter, and it is also the earliest found among the 24 solar terms. Summer solstice is the fourth solar term in summer. Compared with winter solstice, winter solstice and summer solstice are also obviously related in climate. The solstice of winter marks the arrival of winter, while the solstice of summer marks the arrival of summer. Solar terms are a set of systems in ancient China, which are divided according to the sun, the moon, the weather, the position of the earth and the laws of motion, and are used to guide agricultural activities.