The difference between perpetual calendar and yellow calendar

This difference is: different historical origins and different time spans.

1, with different historical origins. The perpetual calendar originated from Zu Ti, the monarch of Shang Dynasty, who observed the changes of the sun and the moon. After years of long-term observation and careful calculation, an accurate solar calendar has been worked out. The monarch named the solar calendar "perpetual calendar" to reward his behavior. The yellow calendar (old yellow calendar) was obtained because ancient people imagined the movements and changes of celestial bodies on the basis of astrology and divination, and it was not until the Tang Dynasty that the yellow calendar was finally determined.

2. The time span is different. "10,000 years" in the perpetual calendar means that the time span is very large, not really 10,000 years, but the time recorded in the perpetual calendar is still longer than the Gregorian calendar, including at least Gregorian calendar, lunar calendar, Tibetan calendar, etc. 100 year.