Why is the perpetual calendar in China different from the old yellow calendar?

Almanac is a time booklet used by rural people in China for many years (until the early liberation), including lunar calendar, solar calendar (originally not available), climate, sowing season, fortune telling (good or bad age, lucky or not), which is very specific and usually passed down from generation to generation \

The perpetual calendar is also a seasonal booklet commonly used in rural areas, but it takes a long time to record (although it is impossible to record 10 thousand years), so it is relatively simple. But the perpetual calendar you mentioned is not clear-isn't the electronic perpetual calendar also a perpetual calendar?

As for the old almanac, I don't know. My guess is that the old almanac gradually developed into the later almanac in production and life.

Almanac, also called almanac, is a code of conduct followed by ancient emperors. It includes not only astronomy, meteorology, seasons, but also some taboos that people should abide by in their daily lives. Because only the emperor's family can use it, it is called almanac. After the Revolution of 1911, the imperial system was overthrown and the almanac was rewritten as an almanac.