Birthday conversion is to calculate the birth date based on the year, month and day of birth.
The remainder obtained by subtracting 3 from the AD year number and dividing it by 10 (regardless of the quotient) is the number of digits corresponding to the heavenly stems. Subtract 3 from the AD year number and divide it by 12 (regardless of the quotient). The remainder is the number of digits corresponding to the earthly branches. ?
Take 2010 as an example: Heavenly Stem Algorithm: 2010-3=2007, 2007/10=200 Yu 7, 7 corresponds to the 7th digit of Heavenly Stem being Geng, that is, Heavenly Stem is Geng; Earthly Branches Algorithm: 2010- 3=2007, 2007/12=167, the remainder is 3, 3 corresponds to the third digit of the Earthly Branch being Yin, that is, the Earthly Branch is Yin. ?
To sum up, 2010 AD is the year of Gengyin (Tiger) according to the heavenly stems and earthly branches. It can also be calculated that 2019 is: Heavenly Stems: (2019-3)/10=201 more than 6 Earthly Branches: (2019-3)/12=167 more than 12, so 2019 is the year of Jihai (Pig).
The reasons for the birth date and birth date:
The birth date and birth date occupies an important position in the folk beliefs of the Han nationality. Ancient Han astrologers used this to predict a person's destiny. The horoscope prediction technique continues to develop in practice, from Li Xuzhong's three pillars, to Xu Ziping's four pillars, to the four pillars of the sun and the moon. Each step of progress contains the hard work of scholars and social practitioners of all ages. pay.
To get the correct time of birth, the ancient Han people believed that it was most accurate to measure with a sundial during the day. Clock time is artificial mean time and regional standard time. The "true solar time difference" must be calculated based on the solar terms (solar longitude) and the "local longitude time difference" based on the place of birth to obtain the true astronomical time of birth.
In the almanac, the stems and branches of the year and the day are basically included, and the celestial stems of the month and hour can be calculated based on the stems and branches of the year and day. Year, month, day, hour, four pillars, stems and branches, each pillar has two characters, combined with eight characters, so it is called the eight characters of birth date.
The above content refers to Baidu Encyclopedia-Birthday and Eight Characters