China has a history of only 5,000 years. Why is there a perpetual calendar?

The perpetual calendar is the oldest solar calendar in ancient legends of China. The name of perpetual calendar comes from a man named Wannian in Shang Dynasty. He is the editor of this kind of calendar. To commemorate his achievements, he named this kind of calendar "perpetual calendar". A perpetual calendar is an annual calendar that records the dates of specific solar and lunar calendars within a certain time range (for example, 100 years or longer), which is convenient for people in need to query and use. Ten thousand years is just a symbol, indicating a long time span.

The perpetual calendars used now include calendars of several years or calendars suitable for several years. Modern perpetual calendars can simultaneously display various calendars such as Gregorian calendar, lunar calendar and official calendar, and can also contain various functional information such as good or bad luck, holidays and reminders, which is very convenient for people to query and use.

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