What are the main categories of calendars? China lunar calendar belongs to what system? What's so special about it?

& ltp> calendar is a method to calculate time in time units such as year, month and day. & lt/p & gt； & ltp> is mainly divided into solar calendar, lunar calendar and yin-yang calendar. The solar calendar is also called the solar calendar, and its Gregorian calendar year is the tropic of cancer. At present, the Gregorian calendar (Gregorian calendar), which is commonly used in the world, is a kind of Gregorian calendar, also called Gregorian calendar for short. The lunar calendar is also called the lunar calendar, or lunar calendar. Its calendar month is a lunar month, with 12 lunar months, 30 days for the big month and 29 days for the small month. The Islamic calendar is one of the lunar calendars. The average calendar year of the Yin-Yang calendar is the tropic year, and the calendar month is the first month of the lunar calendar. Because of the great difference between the first lunar month and the tropic year in 12 lunar calendar, there is a leap month in the yin-yang calendar, so this calendar is consistent with the moon phase and the periodic movement of the earth around the sun. The lunar calendar in China is a kind of lunar calendar. & lt/p & gt； Other time elements (units) included in the<p> calendar are: