In which dynasty was the winter solstice?

The winter solstice festival originated in the Han Dynasty.

Winter solstice, also known as solstice and winter festival, has dual connotations of nature and humanity. It is not only an important solar term among the 24 solar terms, but also a traditional folk ancestor worship festival in China. The custom of winter solstice varies from region to region in content or detail. In southern China, there are customs of offering sacrifices to ancestors and feasting. In northern China, it is a custom to eat jiaozi from winter to Sunday every year.