How is the chronology of heavenly stems and earthly branches calculated? Which year is the starting year?

Starting from the end of Jiazi, the algorithm is as follows:

1, BC algorithm:

Annual stem = 8-N(N￠8) or 8-N+ 10(N≧8), N= number of years divided by 10 remainder = number of digits of years.

Annual branch = 10-n (n

Example: Find the branch of 22 BC and 159 BC?

Solution: the annual dry of the first 22 years =8-2=6= since, and the annual dry of the previous 159 years =8-9+ 10=9= nonyl;

Annual expenditure in the previous 22 years =10-12 =12 = sea, and annual expenditure in the previous 159 years = 10-3=7= noon;

Therefore, in the first 22 years, the main branch was Jihai, and in the first 159 years, the main branch was Renwu.

2. The algorithm after AD:

Annual drought = n-3 (n > 3) or N-3+ 10(N≤3), where N= the remainder of the year divided by 10 = the single digits of the year.

Annual branch = n-3 (n > 3) or N-3+ 12(N≤3), where N= the number of years divided by 12.

Example: Find the trunk and branches of the year 1 164 and 20 1 1?

Annual dry1164 = 4-3 =1= a, annual dry 2011-3+10 = 8 = symplectic;

Annual expenditure1164 = 0-3+12 = 9 = application, annual expenditure 20 1 1 =7-3=4= gross;

Therefore, Shen Jia is the main branch of 1 164 and Xinmao is the main branch of 20 1 1.

Extended data:

Sixty-year cycle

From thousands of years ago to now, the anniversary of cadres and branches has never stopped, and there are no mistakes. It is an amazing chronicle. At present, it can be clearly verified that it started in Lu Yingong on February 3rd three years ago.

However, there are still many records about the date of the official support in the history books, such as Shang Taishi and Ten Years is only one year, and Yin is cut. January Wuwu ","Shang Wuxu ","Only the moon is glorious, and the next one is dead "and so on record the date of the dry branch. So it is enough to prove that the dry calendar was used before the Zhou Dynasty.