When does the Buddha's Christmas begin?

From the Taoist point of view, the beginning of the winter solstice is the Buddha's Christmas.

The solstice of winter is an extraordinary day, which is the beginning of Buddha's Christmas. Jade Qing is the first god of the highest Taoist god "Sanqing". In the Sanqing Hall of Taoism, the Buddha in the middle seat holds a millet bead, which symbolizes the "infinite" state of "the world is invisible and everything is unborn". Heaven is endowed with the spirit of nature, which existed before the universe.

Extended data:

Tianzun Christmas and the winter solstice when Yiyang was born have primitive and fundamental significance. Therefore, the winter solstice, which is made at sunrise and rested at sunset, with short days and long nights, is the Buddha's Christmas at the beginning; On the solstice in winter, the cathode reaches the highest point and the sun reaches the southernmost point, which is the tropic of Capricorn. In our northern hemisphere, the days are very short, that is to say, the days are the shortest and the nights are the longest in winter solstice.

After the solstice of winter, the days are getting longer and longer, and the spirit of the sun is rising. This is the beginning of a solar cycle, the natural transformation of Yin and Yang, and the day of blessing and good luck given by God.

Baidu Encyclopedia-Yuan Shi Tian Zun