20 19 when is the 27th day of the third lunar month?

The lunar calendar is based on the cycle of the moon, which starts with a new moon and ends with a full moon. The lunar calendar is generally divided into twelve months, and the length of each month varies, some are 29 days, some are 30 days, and some are even leap months, with a length of 29 days or 30 days.

Calendar months are calculated according to the time of new moon and full moon. Generally speaking, the first day of each month is a new moon, and the middle of the month is a full moon. But because the period of the moon is not an integer, the length of each month is not fixed.