Do perpetual calendars and calendars mean the same thing?

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.

Calendar: China had a calendar about 4000 years ago. According to a page of Oracle bone calendar in Oracle Bone Inscriptions, it is proved that the calendar of Yin Dynasty has reached a considerable level. This page of Oracle Bone Inscriptions is the oldest almanac of all mankind, and this page of Oracle Bone Inscriptions is also called the calendar. But the real calendar appeared. About 1 100 years ago, during the Yongzhenyuan period in Tang Shunzong, the imperial calendar was already used in the palace. The first day is a page, recording the state, court events and the words and deeds of the emperor. The imperial calendar is divided into twelve volumes, each volume has the same number of pages as the number of days per month, and each page indicates the number of days and dates.