Why is there a leap month? That is, there are two May and April in a year or something. How is it discharged?

Calendars are divided into solar calendar, lunar calendar and yin-yang calendar. The solar calendar is divided according to the movement cycle of the sun, and there is a leap year phenomenon. Fixed in February, one day more than the normal year, that is, 29 days.

In the lunar calendar, the profit and loss cycle of the moon is one month, and the product of 12 months is one year. Without considering the movement law of the sun, it does not show the warmth and coldness of the four seasons.

The lunar calendar in China is the lunar calendar, with the lunar month as the month and the solar year as the year. According to the lunar calendar, the big month is 30 days, the small month is 29 days, and a year is 12 months ***354 or 355 days, which is about 1 1 day less than the return date, and one month less after four years. In order to solve this problem, we will

According to the China lunar calendar, a month without "neutral qi" is a leap month. Ancient astronomers called odd numbers of the 24 solar terms solar terms and even numbers neutral gas. There are 12 solar terms and 12 neutral qi in a year. It is stipulated that 12 months of the lunar calendar should be marked with 12 neutral qi. For example, it must rain in the first month.

The reason why there will be a month without gas is because the 24 solar terms are determined according to the solar calendar. The neutral gas determined according to the solar calendar will be delayed by one day every month in the lunar calendar. If it is postponed to the end of the month, there will be only solar terms next month, and there will be no neutrality.