How to calculate the annual Tian She Day? It's the day when my hometown goes to the grave, but I don't know how to calculate it.

Tian She Day? Today is supposed to be forgiveness day, right?

According to the records in the Book of Star Life, the so-called "forgiveness day" should be the five shades in spring, the Wu Jia in summer, the five applications in autumn and the Jiazi in winter.

January, February and March are spring, April, May and June are summer, July, August and September are autumn and October, November and December are winter.

In the past, people used heavenly stems and earthly branches (abbreviated as Ganzhi) to represent date, month, day and hour, and each moment was composed of four Ganzhi (eight characters) (abbreviated as eight characters).

As the saying goes, "Spring meets Wuyin Summer and Wu Jia, autumn is worth five gods, and Jiazi is the best in winter, which helps a lot."

In other words, five cloudy days in spring, Wu Jiari in summer, Pentecost in autumn and Jiazi Festival in winter are "forgiveness days". It is believed that the God of Heaven will forgive the sins of all beings on this day, which is most conducive to eliminating disasters and praying for a long life. This is an auspicious day.

20 17 the four days of forgiveness are:

1, and the date of forgiveness in spring is: April 2 1 day of Gregorian calendar (March 25th of lunar calendar);

2. The date of forgiveness in summer is July 6th in Gregorian calendar (June13rd in lunar calendar);

3. The autumn forgiveness date is: September of Gregorian calendar 18 (July 28th of lunar calendar);

4. The forgiveness date in winter is: Gregorian calendar 65438+February 3rd (October 16th of the lunar calendar).

Judging from the known Gregorian calendar date, it takes a lot of calculation to accurately calculate the dry branch date.

The formula is roughly as follows:

Known: C century, Y year, M month, D day, calculate the day of the day:

1, calculate the heavenly stems: g = 4 (c-1)+[(c-1)/4]+5y+[y/4]+[3 (m+1)/5]+d-.

Divide the calculation result by 10 and see the remainder. If the remainder is 1, the heavenly stems are "a"; If the remainder is 10, the heavenly stems are "decyl";

2. Calculation of ground support: z = 8 (c-1)+[(c-1)/4]+5y+[y/4]+[3 (m+1)/5]+d+7+i.

Divide the calculation result by 12 and see the remainder. If the remainder is 3, the ground branch is "Yin"; If the remainder is 1 1, the earthly branch is "Geng".

Special instructions:

1, if it is 1 and February in Gregorian calendar, m is 13 and14 respectively;

2.[? ] symbol, indicating that the internal calculation result is rounded;

3. If m is odd, I will take 0; If m is an even number, I take 6.

Taking 2017,21as an example, the trial calculation:

20 17 is 2 1 century, so C=2 1, and other landlords should be clear: Y=20 17, M=4, D=2 1, I=6.

1, calculate the heavenly stems: g = 4 (21-1)+[(21-1)/4]+5 * 2017+[20/]

10695÷ 10, the remainder is 5, so: Tiangan is "e".

2. Calculation of ground support: Z = 8 (21-1)+[(21-1)/4]+5 * 2017+[201].

1079 1÷ 12, the remainder is 3, so the ground branch is "yin".

So: April 20th17,21is Wuyi Day.

What is written above is messy in the "know" display, which is not convenient to watch.

Let's make an image for the landlord (if the image is too small, you can click on the image to enlarge it).