1. When is the winter solstice? The winter solstice is around December 22 every year. The winter solstice in 2021 is Tuesday, December 21, which is the 11th day of the 11th month of the lunar calendar.

2. The origin and customs of the Winter Solstice: The Winter Solstice is a very important solar term in the Chinese lunar calendar. As a traditional festival, it is still frequently celebrated in many areas. As early as the Spring and Autumn Period more than 2,500 years later, the Winter Solstice was identified as one of the twenty-four traditional solar terms in China.

3. Winter Solstice Time: The Winter Solstice begins when the sun reaches 270° of ecliptic longitude, and the time is approximately between December 21st and 23rd of the Gregorian calendar every year. Not fixed to a specific day. The winter solstice festival originated in the Han Dynasty, flourished in the Tang and Song Dynasties, and is still used today.