What knowledge is there in the calendar?

The calendar has constellations and today's VIP time and so on.

Nowadays, the calendars and desk calendars necessary for every family are all developed from calendars, but this is only a history of nearly a hundred years. As for when the calendar appeared, no one knows, but according to historical records, it was used in the palace of Yongzhen Garden in Tang Shunzong about 1 100 years ago. At that time, calendars were also called imperial calendars. They not only recorded dates, but also were important materials for compiling national history. The calendar at that time was similar to that now. The year is divided into 12 volumes, and the number of pages in each volume is determined according to the number of days in each month, with the month and date written on each page, and then handed over to the eunuch who served the emperor for temporary storage. The eunuch recorded the emperor's words and deeds on an empty page every day, handed them over to the emperor at the end of each month and sent them to the historian for archiving. Then, the historian submits the contents of the calendar to the court. Major events in various parts of China have been combined, refined, polished and recorded, which has become a national history. Later, because the calendar brought many conveniences to life, it gradually entered the families of many senior officials in North Korea, and after some changes, it was compiled into its own calendar. Later, with the popularity of calendars and the development of families, people also printed monthly calendars, solar terms and auspicious days on calendars, and