60 Jiashi
The year of stem and branch is 10 day (A, B, C, D, E, G, Xin, Ren and Gui) and 12 day (Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You and Qi). We can look up the perpetual calendar when we need it. But the perpetual calendar can't find ten thousand years, for example, what about BC? For example, what if the calendars of Xia, Shang and Zhou are different? Here are a few simple algorithms to facilitate the query.
First of all, it should be noted that the 60-year-old count of the main branch is not affected by the calendar rules of Xia, Shang and Zhou dynasties, but only by time.
Sixty subsequences:
In each year, the front is 65,438+00 days and the back is 65,438+02 days. There are two words. Heavenly stems and earthly branches is arranged in order, such as Jia Zi and E Chou ... Until the end of Guihai, the least common multiple of 65,438+00 and 65,438+02 is 60, so every 60 years is one, and it goes back to the year of Jia Zi.
One: Calculate the year of AD, as shown in the following figure:
Because the first year of A.D. is a year with a heart, we can make a simple calculation on this basis. The rule is: set the "Xin" of Tiangan to 1, then 2, 3, etc. Set the "unitary" of the ground branch to 1, then 2, 3, etc. Find out the heavenly stems corresponding to the mantissa in the heavenly stems from the mantissa in AD; Divide the AD calendar year by 12, and use the remainder to find the earthly branch corresponding to the remainder, thus obtaining the AD calendar year. For example, 19 1 1 year, its mantissa is 1, which corresponds to "symplectic" of heavenly stems; Divide1911by 12 to get 159, the remainder is 3, and the corresponding branch is "Hai", which is the year of Xinhai.
The second type: calculate BC, as shown in the figure below;
For example, BC 1, mantissa is 1, and the corresponding heavenly stems are "Geng". If you divide 1 by 12, the remainder is 1, and the corresponding branch is "Shen", then BC 1 is the year. For example, in 55 1 year BC, it was calculated to be Geng Xunian.
The third type: look at the picture below:
Remember the exact year, then add it up in turn, flashback and subtract it, and find out the stem in 60 rounds.
The above is about the sharing of the perpetual calendar of the 60-year comparison table. After reading the 60-year-old calendar quick look-up table, I hope this will help everyone!