What are the basic rules of the lunar calendar in China?

Lunar calendar is a kind of calendar in China, and it is also a kind of lunar calendar, which is generally called lunar calendar. Normal year 12 months, 30 days in the big month, 29 days in the small month, and 354 or 355 days in the whole year (which month is big and which month is small in a year, which varies from year to year). Since the average number of days per year is about 1 1 day worse than that of the solar year, there are 7 leap months in 19, and there are 383 or 384 leap months in a year. According to the position of the sun, a solar year is divided into 24 solar terms, which is convenient for farming. The chronology is matched with heavenly stems and earthly branches, with a period of 60 years. According to legend, this calendar originated in the Xia Dynasty, so it is also called the Xia calendar. Also known as the old calendar.