Is the Gregorian calendar the lunar calendar?

It is not the Gregorian calendar, but the current international calendar, also known as the Gregorian calendar, commonly known as the Gregorian calendar. The moon orbits the earth once (taking the sun as a reference, the actual moon orbits for more than one week) as January, that is, the first month of the lunar calendar is used as the basis for determining the calendar month, and a year is a twelve-month calendar. Calendar based on the apparent movement of the sun, referred to as "solar calendar" or "solar calendar"; The moon is "lunar calendar", and the calendar made according to the apparent motion law of the moon is called "lunar calendar" for short. There is only one real lunar calendar, the Islamic calendar. That is, twelve lunar months are a year, regardless of seasonal changes. The lunar calendar is mainly used to guide their religious festivals, so Muslims fast sometimes in summer and sometimes in winter. However, Islamic countries have established another solar calendar to guide secular life.