What does Gansan mean in Winter Moon?

Gansan means November 23rd of the lunar calendar, and November of the lunar calendar is called "Winter Moon", also called Gu Yue, Changyue, Late October and Midwinter. If December is represented by twelve earthly branches, it is also called "sub-moon" and "sword".

Lunar calendar is a traditional calendar in China. According to the cycle of the moon phase, each moon phase changes to one month, and a tropical year is divided into 24 segments, forming 24 solar terms. The leap month is set according to the tropical year of the sun, so that the average calendar year can adapt to the tropical year. The lunar calendar combines the lunar calendar with the solar calendar to form a method of combining yin and yang.