On September 4, 2023, the old almanac was genuine.

Look up the lunar calendar and solar calendar, also known as Gregorian calendar, Gregorian calendar and solar calendar. They are based on the movement cycle of the earth around the sun, and there are 365 or 366 days in a year, starting from New Year's Day.

The lunar calendar, also known as the ancient calendar, the yellow calendar and the lunar calendar, takes the orbit of the moon around the earth as January, that is, the new moon as the basis for determining the calendar month. Please note that the lunar calendar is not a lunar calendar. There are 354 or 355 days in a year, and the winter solstice begins.

The dry calendar originated in the Xia Dynasty is called the summer calendar. It is a kind of calendar that first adopts the calendar year of the main branch and then adopts the calendar year of the Gregorian calendar. There are 24 solar terms in a year, starting from beginning of spring, and each solar term lasts about 360 days, which is 15 days.

The lunar calendar is also called dry calendar and summer calendar. The lunar calendar is a kind of calendar, and the cycle of the moon phase is the length of the new moon, which is added to the dry calendar. 24 solar terms? Referring to the tropic year as the length of a year, the average calendar year is adapted to the tropic year by setting leap months (for example, the seventh leap in 19 years). The lunar calendar is a calendar based on the lunar calendar and combined with the solar calendar. There are 354 or 355 days in a year, 384 or 385 days in leap months, and the Spring Festival begins.

Conversion between trunk calendar and solar calendar;

New perpetual calendar

1. The advantage of checking the calendar is simple, fast and accurate, but it is not easy to carry.

2. The advantage of formula calculation method is simple, fast and accurate, but the disadvantage is more complicated.

3. The advantage of the formula derivation algorithm is simple, fast and accurate, and the accurate point is that the formula is difficult to remember.

Example 1997 annual trunk-branch conversion:

View the annual tree trunk and branch map in the perpetual calendar.

1. Look up the calendar: 1997 is the year of Ding Chou.

2. Formula method:

Tiangan formula: the number of years in A.D. is reduced by 3 first, and the rest are Tiangan except 10. The reason why the sky is divided by ten is that ten days is ten.

Tiangan algebra table

1997-3= 1994 divided by 10, this algebra is called d.

The formula of earthly branches: the number of years in A.D. is reduced by 3 first, and all the others are earthly branches except 12. The ground branch has 12, so 12 is divided.

Earth branch algebra table

1997-3= 1994 divided by 12, 166 is greater than 2. Look up algebra and know it's ugly. According to the calculation, 1997 is Ding Chou.

In addition, if the formula of earthly branch is not easy to calculate except 12, you can use this formula to calculate:

1900- 1999 year-end double digits plus 1 minus 12, that is, 1997 equals 97+ 1=98-96=2. At the end of 2000- 1999, add 5 to two digits, and then subtract the multiple of 12 to get the remainder.

Note: The mantissa of the year A.D. is less than 3, so it can be supplemented by 10. The sky-stem remainder is zero, indicating that it is a decimal, and the earth-branch remainder is zero, indicating that it is the sea.

The calculation formula of BC:

Annual stem = 8-N(N = the number of years divided by the remainder of 10, that is, the single digits of the number of years)

Ground branch = 10-N(N = number of years divided by the remainder of 12)

Comparison table of twelve earthly branches and twelve zodiac signs

The twelve earthly branches correspond to the zodiac. 1997 is the year of Ding Chou, and the ground supports ugliness. Look up the table, ugliness corresponds to cattle, 1997 is the year of the ox.

Formula for calculating annual branches

From the palm of your hand, you can count the annual stems and branches, and the flowers in Zhi Zi begin.

Yangzhi began on the 10th and lasted for four years.

Every other position is reversed for ten years, and the end of the year is 503.

Sixty numbers are added and subtracted one by one, and thousands of years are in your hand.

Monthly branch calculation: calculated after converting the solar calendar into the lunar calendar. The conversion between solar calendar and lunar calendar is very complicated. In general application, I will remember that the simplest one is to check the perpetual calendar. For example, the Gregorian calendar is1August 997 16, and the lunar calendar is1July 14th 997. The calculation is based on July.

Check the monthly branches in the perpetual calendar.

1. Check the calendar, such as 1997, August 16, the seventh month of the lunar calendar is Wushen, and the main branch is Wushen.

2. Formula method,

The formula of monthly dryness is: monthly dryness = annual dryness ×2+ monthly dryness 65438+ August dryness 0997 = 4(65438+ daily dryness 0997)×2+7 (lunar month) = 15. If it is greater than 10, it will be divided by 10, which is known in algebra.

The monthly land branch is fixed and calculated according to the lunar calendar. As shown in the above picture, January is silver moon, February is Uzuki, March is Chen Yue, April is Mitsuki, May is noon, June is non-month, July is Shen Yue, August is unitary month, September is full moon, October is haiyue, November is next month, and December is ugly month. For example, August 1997 16 is July 14th of the lunar calendar, and the July branch is Shen, so the sun and moon branch of August 1997 is Wu Shen, which is consistent with the perpetual calendar.

12 construction comparison table

December architecture: that is, the corresponding relationship between the lunar month and the twelve earthly branches, and has the following month principles.

(1) Set the month of the winter solstice as the sub-month, which is about the winter month, that is, November of the lunar calendar, and the next month is called the ugly month, that is, December of the lunar calendar.

(2) In the ancient calendar, the first month of the summer calendar was silver moon, also known as Yin Jianyue or Yin Jianyue.

(3) Architecture: The ancients determined the orientation according to the bucket handle direction of the Big Dipper. In the first month, the bucket handle of the Big Dipper pointed in the shade direction, so it was called the first month to build shade.

(4) The first month is the beginning of a year, or silver moon is the beginning of a year.

3. The formula of dry month is "Five Tigers Flee", and the formula is as follows:

In the first year of A's life, C is the year of A's life, and the month of A's life is C.

The year of B Geng is the first year of Wuzi, the year of B Geng is the year of Tiangan, and the month of Tiangan is the year of Wuzi.

Bing Xin must find Geng. The year of the third year is Xin Year, and the month is Geng Year.

Ding Nian Renchen Year is Ding Rennian, and Yuetian Dry Year is Renchen Year.

If you ask Wu Gui which way to send Jia Yin, you should pursue the year of the year, and the month of the year is A.

Heavenly stems and earthly branches algebra table

The ground support is fixed on the table.

The above is about the search of lunar calendar and solar calendar, and it is about the sharing of perpetual calendar. After reading the authentic calendar book, I hope this will help everyone!