Why is the winter solstice in the solar calendar1February 22nd instead of the lunar calendar? What calendar was used in ancient times?

The winter solstice depends on the position of the sun at the southernmost end of the ecliptic, which can be understood as modern science, so the solar calendar is used. In the ancient calendar of China, there was no such thing. In ancient China, a year was divided into 360 days, with 24 solar terms, and the time interval was 15 days.

The winter solstice is a continuation of the twenty-four solar terms in ancient times. According to the lunar calendar, there is only a wet moon this year, and the deviation before and after is in November of the lunar calendar.