The difference between perpetual calendar and old yellow calendar

The difference between the old calendar and the perpetual calendar lies in the historical origin, time span and record carrier.

The difference between the old calendar and the perpetual calendar lies in the historical origin, time span and record carrier. The perpetual calendar originated from the observation of the changes of the sun and the moon in Shang Dynasty, and the recording time span is long, usually in the form of electronic perpetual calendar or APP. However, the almanac originated from ancient people's imagination of the movement and change of celestial bodies, and was generally displayed in the form of books or calendars. In addition, the calendar records a longer time span than the yellow calendar, including at least 100 years of various calendars, while the yellow calendar is generally printed and published with a time span of years, with a large number of rules and contents related to good fortune and avoiding evil, 1. The perpetual calendar is the oldest solar calendar in ancient legends of China. In order to commemorate the achievements of the compilers of perpetual calendars, this calendar was named "perpetual calendar". The perpetual calendar used now is actually an annual calendar that records the dates of a specific solar calendar or lunar calendar within a certain time range (such as 100 years or more), which is convenient for people in need to query and use, and has no direct connection with the original calendar. According to legend, the yellow calendar was created by the yellow emperor, so it is called the yellow calendar. In ancient times, it was calculated and published by Qin, so it was also called the imperial calendar.