The origin of calendar

Calendar from ancient times to the present, there are three views:

1, almanac and so on.

2. Today refers to books with years, months, days, weeks, solar terms and anniversaries. One book a year, one page a day, and withdrawal day by day. Some are hung on the wall, others are on the table.

3. Historians' daily records of national events are the basis for historians to compile national history.

The real calendar was thus created. About 1 100 years ago, the imperial calendar was already used in Yongzhen Garden and Palace in Tang Shunzong. 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.

Nowadays, popular calendars, whether paper publications, mobile phone applications or electronic desk calendars, usually include solar calendars, lunar calendars and dry calendars.

Extended data

Gregorian calendar is an international calendar, namely Gregorian calendar. It was reformed by Italian doctor and philosopher Julius on the basis of julian calendar, and opened by Roman Catholic Pope Gregory XIII in 1582+00+05.

On the basis of julian calendar, the Gregorian calendar has made some adjustments to the setting of leap years, which is for religious reasons, in order to accurately calculate the resurrection day of Jesus. Unless it is divisible by 400, all century years (divisible by 100) have no leap days. Therefore, every 400 years, there are only 97 leap years in the Gregorian calendar, which is 3 leap years less than that in julian calendar.

The average length of the Gregorian calendar is 365.2425 days, which is close to the average tropical year of 365.25438+09074 days, that is, the error is about 3300 days, which is also closer to the tropical year of the vernal equinox, that is, the error is about 8000 days, while the calendar year in julian calendar is 365.25 days, that is, about 65438+.

China adopted the Gregorian calendar in 19 12 1 and was founded in the Republic of China. However, due to historical reasons, the year of the Republic of China is still used. In a similar situation, Japan still maintains the title of emperor, such as Pingcheng. 1949 10 1 People's Republic of China (PRC) was established, and the chronology method was formally adopted.

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