What are the ancient calendars in China?

Gregorian calendar: Also called Gregorian calendar, it is a calendar based on tropical year. Since a tropical year is equal to 365.2422 days, and the number of days in a calendar year must be an integer, there are two kinds of calendar years: a big year is also called a leap year with 366 days, and a small year is also called an average year with 365 days.

Lunar calendar: also known as lunar calendar, is the earliest calendar used by human beings. The lunar calendar takes the change of the moon as the basic cycle, with a big month of 30 days and a small month of 29 days.

Lunar calendar: The lunar calendar consists of three parts: the lunar calendar, the twenty-four solar terms and the time of the dry branch.