Why do solar terms coincide with solar calendar dates?

When you say solar calendar, you mean Gregorian calendar. In fact, calendars are divided into lunar calendar, solar calendar and yin-yang calendar. The solar calendar is based on the relationship between the sun and the earth; The lunar calendar is based on the relationship between the moon and the earth. Solar terms are based on the relationship between the sun and the earth. The solar calendar is a solar calendar, and the lunar calendar is strictly a yin-yang calendar. Considering the relationship between the sun and the moon, solar terms can be matched with the solar calendar.

There is only one kind of Gregorian calendar, which is generally called Gregorian calendar because it is an international calendar.

In fact, his name is Gregorian calendar, which belongs to a kind of solar calendar, commonly known as Gregorian calendar. Its predecessor is the Augustus calendar, and the predecessor of Augustus calendar is julian calendar.

Maybe you want to ask whether the solar calendar was used in ancient China. Some people think that Xia Zhengxiao, the calendar of Xia Dynasty in history, is a pure solar calendar.

The following is for your reference

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