When did China begin to have a calendar year?

The calendar year of People's Republic of China (PRC) adopts the calendar year system of most countries in the world, which was decided at the first plenary session of China People's Political Consultative Conference in September 1949. At the meeting, everyone agreed to adopt the common calendar system in most countries in the modern world, that is, adopt AD as the calendar year of new China.

On September 27th, the second of the four resolutions adopted at the first plenary session of the China People's Political Consultative Conference was: "The year number of People's Republic of China (PRC) adopts AD". ?

The lunar calendar in China uses the period of the moon to determine the time. The way to determine the month is to determine the period of the new moon, which is on the first day of the first month. Because the average length of the first lunar month is 29.530588 days, there are 30 days in the first lunar month and 29 days in the second lunar month.

The average lunar year is 12 months, with 354 or 355 days in the whole year and 353 days in individual years; A leap year is thirteen months, one of which is a leap month, and the name of the month depends on the name of the previous month. For example, the previous month is June and the leap month is leap June.

Leap years have 383 or 384 days throughout the year, and some years have 385 days. The way to set a leap month is that there is no "neutral" month in the lunar calendar as a leap month. The so-called "neutral qi" refers to the singular solar terms among the 24 solar terms, such as the vernal equinox, Xiaoman, Grain Rain, summer solstice and so on.

Twenty-four solar terms are determined according to the cycle of the earth around the sun. This is the solar calendar. So the calendar in China is a combination of lunar calendar and solar calendar.

Extended data

The calendar year is the result of the spread of Christianity, and its use is not forced by anyone. Because of its high accuracy, it has been recognized and used by most countries in the world.

A.D., also known as the "Gregorian era", takes the year of birth of Jesus Christ as the first year of the Gregorian calendar, that is, A.D. 1 year, and there is no 0 year in the Gregorian calendar. Through the research of modern religious scientists and historians, it is found that Jesus was not born in 1 year, but 1 year is the year when Jesus was born.

AD is often represented by a.d. (Latin abbreviation of Anno Domini, meaning "the year when the Lord was born"), while BC is represented by b.c. (abbreviation before Christ, meaning "before Christ").

"A.D." came into being in the 6th century when Christianity was prevalent. At that time, monks attached everything to Christianity in order to expand the ruling power of the church. In 525 AD, a monk named Di Onisi proposed that Jesus was born 284 years before Diocletian in ancient Rome in order to calculate the Easter date seven years later.

He also advocated an epoch-making method from the year when Jesus was born, which was strongly supported by the church. In 532 AD, the church took 284 BC as the first year of AD and used this chronology in the church.

Diocletian era is the time when ancient Rome was proclaimed emperor by Roman ruler Diocletian, that is, 283 years, as a chronology that began in the first year. It is similar to the practice of changing the Yuan Dynasty after the ancient emperor of China succeeded to the throne, such as the first year of Qin Dynasty and the seventeenth year of Qin Dynasty.

The difference between the two is that Rome uses the julian calendar method to calculate time, while China uses the traditional lunar calendar (also known as the Han calendar and the lunar calendar, to be precise, the Yin and Yang calendar), which is actually based on astronomical phenomena.

Baidu encyclopedia-a.d.