There were three chronologies in ancient China. What are they?

Chronology refers to accurately recording the time of historical phenomena in words. China has a long history, which has been recorded in writing since Shang Dynasty, but it was not recorded until the middle of Western Zhou Dynasty. According to the information left by predecessors, Sima Qian clearly recorded the major historical events that occurred in the first year of the Western Zhou Dynasty and thereafter in Historical Records. The first year of the Republic was 84 BC1year. From this year on, the history of our country began to have an exact date.

? Since the reign of Emperor Wu of the Han Dynasty, emperors have always had a title when they ascended the throne, and then they used the title of the emperor to mark the year. Such as: the first year of Kangxi. The Story of Yueyang Tower, Four Years of Qingchun, Pipa Play, Ten Years of Yuanhe, You Baochan, July of the First Year of Yuanhe, Seven Years of Yuanfeng in Shi Zhongshan, Two Years of Shunzhi in Meihualing, Two Years of Deyou and Two Years of Southward Return.

Chronological methods used in the Spring and Autumn Period and the Warring States Period, such as Zuo Zhuan written by Zhao Haoqi Huiwen in the 16th year. The Battle of Dice: "In the spring of thirty-three years, the Qin Dynasty crossed the North Gate of Zhou Dynasty." I stayed in Lu Xigong for thirty-three years. Biography of Lian Po and Lin Xiangru: "In the sixteenth year of Huiwen, Lian Po was General Zhao."

Chronology of the Republic of China: 19 12 After the founding of the Republic of China, 19 12 was designated as the first year of the Republic of China. Since then, the chronological laws of the Republic of China have appeared.

The method of chronology of trunk and branch adopts the method of one-to-one correspondence between "heavenly stem" and "earthly branch" Characterized in that:

First, heavenly stems and earthly branches each forms a calendar year, such as "Jiazi Year" and "Ugly Year".

B, heavenly stems and earthly branches collocation is always singular to singular, even to even, it is impossible to combine even and singular.

C, a cycle of 60 years, cycle after cycle.

Tiangan: The year is÷÷10, excluding quotient, depending on the remainder. If the remainder -3 is positive, it will count down in the order of heavenly stems; if the remainder -3 is negative, it will be+10; if the remainder is 3, it will be the last digit of heavenly stems, namely.

Ground branch: year ÷ 12, regardless of the obtained quotient, see the remainder. If the remainder -3 is positive, count down according to the order of the earth branches, and the number obtained is the number of the earth branches. If the remainder -3 is negative, it is+12, and the obtained number is the ordinal number of the earthly branch. If the remainder is 3, it is the last digit of the earthly branch, that is, hai.

Combine the number of heavenly stems with the number of earthly branches, that is, the year of heavenly stems and earthly branches. For example: 20 12, the calendar is a non-birth year, and the algorithm is: 2012 ÷10 = 200 ... 22-3 =-1= 9. Ninth place. 2012 ÷12 =167 ... 88-3 = 5, calculated in the order of earthly branch, child, ugly, yin, Mao and Chen. The fifth place is Chen. According to the above calculation results and heavenly stems and earthly branches, we can know that 20 12 is a non-zero year.

? The emperor's year number is placed in front of the emperor's year number, and the emperor's year number is placed behind the emperor's year number.

For example, "Yangzhou Slow", "Xichun Shen Bing" and "Xichun" all belong to Zhao Shen and Song Xiaozong.

In the year number, "Shen Bing" is the year of the main branch; In the story of Nuclear Power Ship, "Apocalypse" is the autumn in Ren Xu, "Apocalypse" is the year of Zhu Youxiao, and "Ren Xu" is the year of dry support. In Ding Haidong's Sacrifice to Sister Kuangganlong, "Gan Long" is the title of Qing Emperor Aisingiorro Li Hong, and "Ding Hai" is the year of Ganzhi. Meihualing records "April of the second year of Shunzhi", which is the title of Aisingiorro Fu Lin, the ancestor of the Qing Dynasty, and "Yiyou" is the year of Ganzhi.