< lt method 1 > 60-ring circumference extrapolation algorithm
Methods: Calculate the branches and branches in a given year according to the order of 60 charts.
For example, it is known that 20 16 (after the Spring Festival) is the year of Shen Bing, and 2020 is sought.
Answer: Find Shen Bing in the table and push it back four years. We can know that 2020 (after the Spring Festival) is the year of boxer.
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Calculation method of annual trunk and branch
< method 2 > formula calculation method
Methods: Find the annual stem and branch, the formula is (the number of years in the current year -3)÷60, and the rest is the annual stem and branch algebra, and then find the corresponding stem and branch in the 60-ring diagram. The reason why the number of years is reduced by 3 is that the fourth year of AD happens to be the year of Jiazi. Starting from the fourth year of AD, the three years before AD will be reduced, so this formula is applicable after the fourth year of AD.
Example: Find the main branch of 1979.
Answer: (1979-3) ÷ 60 = 32...56. Find the corresponding branch of 56 in the 60-ring map, and you can know that 1979 is the last year.
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Calculation method of annual trunk and branch
< Method 3 > The mantissa is fixed in the sky and the remainder is fixed in the ground.
(1) Calculation method of trunk after AD:
Because Tiangan and our current AD calendar are in decimal system, it can be inferred that the mantissa of AD calendar is the same, so Tiangan should be the same. It has been confirmed that the first year of A.D. is the first year of the reign of Emperor Ping of the Western Han Dynasty in China, and is, so the corresponding symplectic number is 1. By analogy, the corresponding heavenly stem ordinal number table can be obtained.
Since there are twelve earthly branches, the earthly branches should be the same every twelve years. Knowing the earthly branches in one year, we can calculate the earthly branches in other years. ? It has been confirmed that the first year of A.D. was the first year of the reign of Emperor Ping of the Western Han Dynasty in China, so the year corresponding to the earthly branch should be 1. By analogy, we can get the ordinal number table corresponding to the earthly branch.
For example, find 19 1 1 year.
Answer: the mantissa of 19 1 1 is 1, which is heavenly stem; 1911÷12 =159.3, the remainder is 3, and the earthly branch is the sea. So 19 1 1 is the year of Xinhai.
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Calculation method of annual trunk and branch
< Method 3 > The mantissa is fixed in the sky and the remainder is fixed in the ground.
(2) BC chronology calculation method:
There is only one cell between BC 1 and AD 1, which is different from the number axis in mathematics and has no origin 0. Therefore, to calculate the gap between the years before and after A.D., it is usually to add the two numbers before and after and subtract one. The first year of A.D. is a year with a heart, so BC 1 should be the year of Gengshen, and BC 2 should be the last year. From this, the ordinal number table corresponding to BC branch can be deduced as follows.
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Calculation method of monthly stem and monthly branch
Methods: In the lunar calendar, each earthly branch corresponds to 24 solar terms from one solar term (non-neutral gas) to the next, and the starting period of a month is determined by the node time, not from the first day to the end of a certain lunar month. Many almanac shows that a lunar month corresponds to a branch, which is only approximate but not complete. In case of a or one's own year, the first month is roughly C Yin; B or Geng Year, the first month is roughly Wuyin; The first month of year C or Xin is roughly Geng Yin, the first month of Ding Nian or Ren Year is roughly Ren Yin, and the first month of year E or decyl is roughly Jia Yin. The remaining months are calculated as the first month. There is a song formula:
At the age of Aji, C was the first, and at the age of B Geng, E was the first.
At Bing Xin, Geng Yin and Ding Sui, Yin went down the river.
You said there was no way to start, so the good news went up to find it.
For example, if 1995 is the year of B-Hai, calculate its branches and branches in June of 10.
A: Every two years, Wuyin is the first month, and it is estimated that its main branch in October is Dinghai.
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Calculation method of daily dry and daily branch
& lt method 1 > Given the branch on New Year's Day in a certain year, calculate the daily branch.
Formula: daily work algebra = New Year's Day work algebra+required days+monthly addition and subtraction-daily work turnover.
Daily Branch Algebra = New Year's Day Branch Algebra+Days Required+Month Addition and Subtraction-Turnover Branch.
Note: 1. Monthly addition and subtraction are calculated according to the number of days and 60 cycles.
2. The monthly addition and subtraction table is as follows.
For example, if it is known that the trunk and branch of 198 1 year is "Jimao", then find the daily trunk and branch of 14 of that year.
Answer: 198 1 is the average annual and daily branch algebraic calculation.
Sun Gan algebra = 6+14+1-2×10 =1(a)
Japanese branch algebra = 4+14+7-2×12 =1(sub),
Therefore, the trunk line on1981August 14 is Jiazi.
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Calculation method of daily dry and daily branch
< Method 2 > Knowing the New Year's Day, we can deduce the trunk and branch of the New Year's Day in the required year, and then deduce the daily trunk and branch of that year.
Formula: ① Find the New Year's Day trunk and branch of the next year in a normal year = the base of the New Year's Day trunk and branch in a normal year +5.
(Because the difference between New Year's Day in a normal year and New Year's Day in the following year is 5 days)
(2) Leap year is New Year's Day of the following year = New Year's Day base of leap year +6.
(Because there is a difference of 6 days between New Year's Day in leap year and New Year's Day in the following year)
For example, it is known that the New Year's Day branch in 1980 is Gui You. Please look for the New Year's Day branch in 198 1.
Answer: 1980 is a leap year, and the daily branch algebra calculation.
Sun Gan algebra = decyl 10+6- 10=6 (f),
Japanese branch algebra = unitary 10+6- 12=4 (M),
Therefore, the main branch of 198 1 is its own base.
Calculation method of daily dry and daily branch
Given the daily work and daily expenses of a certain day in a certain year, find the daily work and daily expenses of that year or other years.
Steps: ① First, find out the total number of days; (2) the unit number of the total number (if the unit number is 0, it is 10), as the basis of daily work, and the daily work is calculated according to the sequential value; (3) Take the remainder of the total divided by 12 (12 if divisible) as the cardinal number of daily branches, and calculate the daily branches in sequence.
For example, it is known that 1 4th of the month 1988 is the main branch of 1988.
Answer: ① Find the total number of days.
January, February, March, April, May, June, July and August.
28+29+31+30+31+30+31+23 = 233 days.
(2) The total number of single digits dried on the day.
The unit number is 3, from E to G, so the daily work is G.
③ Push the daily branch with the remainder of the total divided by 12.
233 ÷ 12 = 19.5, from noon, noon → non → application → unitary → Xu, so the Japanese branch is Xu.
Therefore, on August 23rd, the main branch was Geng Xu.
Calculation method of time trunk and branch
It is fixed that twelve o'clock every day coincides with twelve earthly branches. Because a day starts at midnight, the calculation also starts at midnight, and then you can know the branches and branches of the day by going down. When I get up in the morning, this song goes like this:
A has been added to the beginning of a, b, g and c, and c is new.
Ding Ren Geng Zi voted, Wu Guiren Zi, and asked again and again.
A has already started from Jiazi: A day, midnight, midnight, starting from Jiazi, pushing B ugly, etc.
B Geng starts from C Zi: B Day and G Day start from C Zi at midnight, and then push B Ugly.
Bing Xin starts from Wuzi: the children of Bing Ri and Xin Ri start from Wuzi at midnight, pushing ugliness and so on.
Ding Renqi's Gengzi: Ding Riren started from Gengzi in his childhood, pushing away ugliness and so on.
In the middle of the night, it will start in the middle of the night, and it will push ugliness and so on.
For example, find a branch at 6 o'clock on your day.
Answer: From Decimal Day, Shi Mao was at 6 o'clock, and from Zishi to Shi Mao, we pushed four places, so from Nonen, we pushed four places: Nonen, Decimal, A and B, so at 6 o'clock in the morning, the main branch was Erji.
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