Why is it so good to write on the calendar, but not on the perpetual calendar?

What is written on the calendar is not good on the perpetual calendar because the functions of the two calendars are different. The perpetual calendar is the oldest solar calendar in ancient legends of China, and people often refer to the course of a certain year, including many years. According to legend, the Yellow Calendar was created by the Yellow Emperor, and it is called the Yellow Calendar. It is based on the lunar calendar and inferred from China's gossip and five elements. The yellow calendar is used to choose good luck.