What's the saying about leap month?

It is one of the ways of calendar leap. That is 1 month added in the leap year of the lunar calendar. The lunar calendar is a lunar calendar, which stipulates that a month without gas is a leap month, and the name or ordinal number of the month above is called a "leap month".

When ancient astronomers compiled the lunar calendar, in order to make any day in a month contain the meaning of the moon phase, that is, the first day is a moonless night and the fifteenth day is a full moon, so the first day is mainly the first month. At the same time, considering the season, they adopted the method of seven leaps in nineteen years: in the nineteenth year of the lunar calendar, there are twelve ordinary years and one ordinary year has twelve months; There are seven leap years and each leap year has thirteen months.

In Asia (especially China), leap month refers to one month added every two to three years in the lunar calendar. In order to coordinate the contradiction between the tropic year and the lunar year and prevent the lunar year from being out of touch with the tropic year, that is, the four seasons, 1 leap is set every 2~3 years.

In ancient times, there was a leap week, and there were seven leaps in nineteen years. By the time of Linde calendar in Tang Dynasty, the fixed leap week was abolished, and the leap was set in the month without season, so it was leap time.

Lunar calendar is a traditional calendar in China. The traditional lunar calendar is based on the lunar calendar and combined with the solar calendar, that is, the combined calendar of yin and yang.

The solar calendar is based on the tropical year when the earth revolves around the sun. The lunar calendar determines the date and month according to the change of the moon's profit and loss and the phase of the moon. The average lunar month is 29.5306 days, and 12 lunar month is 354 days or 355 days, which is about 1 1 day different from the tropical year of the solar calendar (about 365.25 days), and the accumulated time difference in three years will exceed one month.

Because of the solar calendar, the lunar calendar is a calendar that takes into account the relationship between the sun, the moon and the earth, and belongs to the yin-yang calendar. Because the pure lunar calendar does not consider the movement of the earth around the sun, the changes of the four seasons have no fixed time on the lunar calendar and cannot reflect the seasons.

Unlike the fixed solar year of 365 days or 366 days, the solar year sometimes differs from the lunar year by one month. In order to coordinate the number of days between the lunar year and the solar year, the lunar calendar adopts the "leap method" to adapt to the total number of days in these two years.