Is the winter solstice a solar term or a festival?

The winter solstice, with both natural and humanistic connotations, is not only an important solar term among the 24 solar terms, but also a traditional folk festival in China, which is known as "the winter solstice is as big as a year". The solstice in winter is the starting point for the return of the sun. Since the winter solstice, the sun has risen to a high place, and the days are getting longer and longer. The solstice in winter marks the rebirth of the sun and the movement of the sun back and forth into a new cycle. Therefore, the ancients regarded the solstice in winter as a "good day". Among the eight festivals in a year, the solstice in winter is as important as New Year's Day in spring.