What are the three major calendars in the world?

The lunar calendar is one of the traditional calendars in China, also known as the old calendar, the Han calendar and the ancient calendar. After the Revolution of 1911, it was changed to the western solar calendar (Gregorian calendar), and the modern lunar calendar belongs to the combination of yin and yang.

2. Gregorian calendar

The solar calendar is a calendar based on the movement cycle of the earth around the sun. The month and date of the solar calendar are very consistent with the position of the sun on the ecliptic.

According to the date of the solar calendar, we can clearly see the changes of cold and warm seasons in a year; But every month, you can't see the new moon, the new moon, the new moon.

3, Yin and Yang calendar

Lunar calendar refers to the calendar in astronomy that takes into account the relationship between the sun, the moon and the earth. In the lunar calendar, the moon orbits the earth 1 month, but a leap month is set to make the average number of days in a year consistent with the number of days in the tropical year, so this calendar is consistent with the moon.

It also conforms to the periodic motion of the earth around the sun. The summer calendar is a kind of lunar calendar, and the specific calendar also includes the method of chronology (era).

On March 1 5821day, Gregory issued a calendar change order with the following contents:

1, 1582, 10, 10, the day after October 4th is 10, 15 instead of 10, but the serial number of the week is still counted continuously. 10 is Thursday and the next day is 10. In this way, the old accounts accumulated since 325 AD will be written off.

2. In order to avoid drifting away from the vernal equinox in the future, the leap year method is changed to:

A leap year is a year in which the number of AD years is divisible by 4, but when the number of AD years is followed by a century year with two zeros, a year that is divisible by 400 is a leap year.

The average length of the Gregorian calendar is 5: 49: 12 seconds on 365 days, which is 26 seconds longer than the tropic of cancer. According to this calculation, there will still be an error of 1 day after 3000 years, but this accuracy is quite remarkable.

Because the Gregorian calendar is concise, easy to remember, accurate and in good agreement with the weather, it is gradually adopted by governments all over the world. After the Revolution of 1911, the Gregorian calendar was officially used in China from 19 12 1.

Baidu encyclopedia-calendar

Baidu encyclopedia-lunar calendar

Baidu encyclopedia-Gregorian calendar

Reference to the above content: Baidu Encyclopedia-Yin and Yang Calendar