What is the lunar calendar?

The lunar calendar is one of the traditional calendars in China, and it is also a lunar calendar.

In astronomy, the lunar calendar mainly refers to the calendar arranged according to the phase cycle of the moon. The moon revolves around the earth for one month and a year is twelve calendar months. In the process of calendar development, the appearance of 24 solar terms was used to guide agricultural production scientifically, thus forming the lunar calendar.

On the calendar, I saw the expression "the seventh day of the seventh lunar month, the ninth day of the great summer". The seventh day of the seventh lunar month in front of me is the lunar expression in the lunar calendar, while the ninth day of the hot summer is the solar expression in the lunar calendar.

Introduction to Gregorian calendar:

Gregorian calendar is Gregorian calendar. Now the international calendar is mainly used, which is called Gregorian calendar. The Gregorian calendar takes a tropical year as a year and then divides it into twelve months.

Among them, the number of months is 3 1 day, 30 days and 29 days, all of which are artificially specified, and are called solar calendars, that is, solar calendars. Because it is customized by westerners, people in Hong Kong and Taiwan are also called solar calendar and AD.