Is there any law in the lunar leap month?

The lunar year is 12 or 13 months, and the number of days in each month is 29 or 30 days, and the leap year is 13 months. The average lunar year in China is 353 or 354 days, and the leap year is 384 or 385 days, with an average of about 365.2422 days per year (that is, the earth goes around the sun once).

The lunar calendar basically takes 19 as a cycle. Since the lunar calendar lasts about 355 days a year, which is about 1 1 day different from that of the earth, there should be a leap month every three years and seven leap months every 19 years. A year with a leap month is also called a leap year. The specific leap month depends on the elasticity of solar terms. For example, in the Gregorian calendar, May 27th, 2006, 5438+0, May 27th 1982 and May 27th 1963 are the fifth day of leap April.

The month of the leap month is inferred according to the laws of the lunar calendar, which is mainly determined according to the coincidence with the 24 solar terms of the lunar calendar. Since the winter solstice, odd numbers are solar terms and even numbers are neutral. If it is the turn of the month, only the solar terms are not neutral, that is the leap month last month. ? The number of leap months in the lunar calendar is 29 or 30 days, just like normal months.

Extended data:

Advantages of the lunar calendar:

1. Lunar calendar is a fixed calendar with the characteristics of astronomical calendar, which can well correspond to various astronomical phenomena, such as its solar terms strictly correspond to the height of the sun, calendar days strictly correspond to the moon phase, the frequency of non-occurrence and occurrence of leap months corresponds to the perihelion and distant day of the earth, and other astronomical phenomena, such as sunrise and sunset. Dawn, five-star orientation, solar eclipse, tide, etc. Even calendar months roughly correspond to the height of the sun;

2. The lunar calendar has only 29 days and 30 days, which is stipulated by the date of the new moon. The human factor is minimal and it is not easy to change it at will;

3. The beginning of a year has a strong astronomical significance, and it has the astronomical significance of the year of the sun and the moon;

4. The lunar calendar is the best embodiment of the traditional culture of the Han nationality, which is the unity of heaven and man and the birth of yin and yang;

5. The chronology of trunks and branches and the chronology of the zodiac are recycled; Because it contains solar terms, it is very beneficial to the division of the four seasons, and because it contains the moon phase, it also reflects the influence of tides, eclipses and other celestial phenomena and the moon on the climate.

Lunar calendar (China traditional calendar)-Baidu Encyclopedia