The difference between perpetual calendar and old yellow calendar

The difference between the perpetual calendar and the old calendar lies in the scope and content of use.

Perpetual calendar is a common calendar tool, which is used to record dates and times, usually including information such as Gregorian calendar and lunar calendar. It provides accurate date and time information and can help people arrange their daily lives and work. The Old Yellow Calendar is the traditional lunar calendar in China, which includes not only the Gregorian calendar and lunar date, but also some folk traditions and superstitions, such as auspicious days and constellations. Old almanac is used by some people to predict good or bad luck and choose appropriate action time, but its scientificity and accuracy remain to be discussed.