The solar calendar is a new calendar, and the lunar calendar is a lunar calendar?

The saying that the solar calendar is a new calendar barely makes sense. It makes no sense to say that "the lunar calendar is the lunar calendar"!

At present, there are three kinds of calendars used in the world: solar calendar (such as Gregorian calendar, Islamic solar calendar, and Yi October calendar), lunar calendar (only Islamic calendar, only countries and nations that believe in Islam are used in religious activities), and yin-yang calendar (such as China's lunar calendar and Tibet's yin-yang calendar).

The Gregorian calendar has only been used in China since the Republic of China, and people call it "new calendar" or "solar calendar" for a certain reason. But it is meaningless to equate the lunar calendar with the lunar calendar, because the lunar calendar is a kind of yin-yang calendar, not the lunar calendar!

Please refer to my article "Introduction to Calendar" published in Baidu Library.