Which version of the almanac calendar is accurate?

Both the perpetual calendar and the yellow calendar are accurate, but the functions of these two calendars are different. The perpetual calendar is the oldest solar calendar in ancient legends of China, but people only look for the course of a certain year, including many years. According to legend, the yellow calendar was created by the yellow emperor, so it is called the yellow calendar. Generally, it is based on the lunar calendar, plus China's eight diagrams and five elements. The Gregorian calendar is used to choose good luck, depending on which one you choose.