The difference between Pengzu calendar and perpetual calendar.

1. The calendar calculated by Peng Zuli is different from what we have now. According to experts and scholars, people at that time were called sixty days a year.

2. A perpetual calendar is a year that records the dates of specific solar and lunar calendars within a certain time range (such as 100 years or more). Ten thousand years is just a symbol, indicating a long time span.