According to the lunar calendar, the big moon has 30 days and the small moon has 29 days, so 12 months has 354 days in a year. The month of the lunar calendar has no seasonal significance, so the year difference between one year and the solar calendar is 1 1 day. Just after 17 years, the date of the lunar calendar will be reversed with the seasons. For example, a year's new year is in.
The use of such a calendar naturally cannot meet the needs of agricultural production, so the lunar calendar in China has been in parallel with the 24 solar terms since the Qin and Han Dynasties, and the 24 solar terms are used to guide agricultural production. ?
Extended data:
Introduction of leap month:
A leap month is a way to set a leap month in a calendar. In Asia (especially China), leap month refers to the lunar calendar (also known as the lunar calendar);
Every leap year is increased by one month (in order to coordinate the contradiction between the tropic year and the Han calendar year and prevent the month of the Han calendar year from being out of touch with the tropic year and the four seasons, 1 leap is set every two to three years. In ancient times, 19 leap week was used, and in Tang Dynasty, Lindeli abolished fixed leap week;
It is a leap in a month without seasons, so it is a leap in a leap. Sometimes leap month also refers to the month that contains leap day in leap year of Gregorian calendar (that is, February of leap year of Gregorian calendar).
References:
Baidu encyclopedia leap moon