Gregorian calendar is the universal Gregorian calendar. 1949 On September 27th, the first plenary session of China People's Political Consultative Conference adopted the internationally accepted Gregorian calendar era, and designated Gregorian calendar 1 month 1 day as New Year's Day. Because the first day of the first lunar month is usually around beginning of spring, the first day of the first lunar month is designated as the Spring Festival.
At the end of the Roman Republic, Caesar formulated the julian calendar according to this calendar of ancient Egypt, and implemented it throughout Rome. Julian calendar has a big moon of 3 1 day and a small moon of 30 days, alternating between big and small months. Every four years is a leap year, with 30 days in February and 29 days in a normal year. When Caesar's nephew Octavian ruled Rome, August was changed to big month because Octavian's birthday was in August.
The origin of the solar calendar
September is changed to abortion, and so on, and one day is subtracted from February. The average year in julian calendar is 365.25 days, a little more than the actual solar year of 365.2422 days. This became a serious problem after 1000 years. Because this calendar is widely used in Europe, the dates of the vernal equinox are ten days apart by 1582, so Pope Gregory XIII changed the calendar according to the opinions of astronomers.
On the one hand, it moved back to vernal equinox; On the other hand, there is no leap for the century year, that is, the year divisible by 100, but there is still a leap for the year divisible by 400. So 1600 and 2000 are leap years, while 1700 and 1800. The Gregorian calendar has 365.2425 days a year, which is extremely accurate. Because of its simplicity and practicality, it is gradually adopted by countries all over the world and is called "Gregorian calendar".