Does birthday have anything to do with Zhouyi?

Date of birth, abbreviated as eight characters, refers to the calendar date when a person is born; Year, month, year and day have * * * four columns, each with two characters, which are called * * * eight characters.

Birthday plays an important role in Han folk beliefs, and ancient Han astrologers calculate people's fate accordingly. Eight-character prediction is developing continuously in practice. From Li's tripartite confrontation to Li's tripartite confrontation, and then to the four pillars of the sun, the moon and the moon, every step of progress contains the hard work of scholars and social practice activists in past dynasties.

In order to get the correct birth time, the ancient Han people thought that the sundial instrument was the most accurate measurement during the day. When the clock time is the artificial average time and the regional standard, it is necessary to calculate the "apparent solar time difference" according to the solar terms (ecliptic) and the "local longitude time difference" according to the place of birth, so as to get the real astronomical birth time.

In the almanac, there are basically annual and daily branches, while monthly and hourly branches can be calculated according to the annual and daily branches.