Who wrote the Gregorian calendar and how?

The almanac is a kind of almanac that can display various calendars such as Gregorian calendar, Lunar calendar and Ganzhi calendar at the same time, and has a large number of rules and contents related to seeking good fortune and avoiding evil.

People in the Gregorian calendar are also commonly known as "general books". However, in Cantonese, because the word "Shu" in Tong Shu is homophone with the word "lose", it is also called "Tong Sheng" because of taboo.

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.

In modern times, the main contents of the Gregorian calendar include: Gregorian calendar, lunar calendar and trunk calendar, twenty-four solar terms and Sunday (week), taboos, disasters, directions, fleeting time, traditional lunar calendar, nine planets in Kong Xuan and so on. Rich in content, different from each other because of its compilation and publication.