How did the ancients divide the days?

Heavenly stems and earthly branches is twenty-two Chinese characters used in ancient times, including ten heavenly stems, namely, A, B, D, E, G, N, N; There are twelve branches, namely Zi Chou Yin Mao and Tatsumi Shen You Xu Hai at noon. The combination of the two forms 60 nails, which cycle year, month and day. According to the age of 60, we can work out the specific year, month, day and time. In the use of timing, because a day is twenty-four hours, which happens to be twelve o'clock in ancient times, the conversion relationship between two hours and one hour is formed. Specifically, from 23: 00 to midnight 1, 1-3 is ugly, 3-5 is Yin Shi, 5-7 is Shi Mao, 7-9 is Chen Shi and 9-6544 is Chen Shi. 1 1- 13 is noon, 13- 15 is inappropriate, 15- 17 is the application time,17-/kloc. In addition to this timing, another branch timing method is also associated with the calculation of branch days, forming a 60-branch timing method, that is, the date of Jia Ji begins with A, when it becomes Jia Zi, then when the clown becomes B Ugly, when Yin Shi becomes C Yin, and so on. When the date of B Geng begins with C, it becomes C; Bing Xin Tian began with e and became a pentathlon. Ding Ren's days began with Geng and he became a boxer. When Pentecost began with nonyl, it became nonyl. In this way, 60 days of heavenly stems have formed a complete chronological method, and everyone will have a definite date of birth consisting of four groups of heavenly stems and eight characters, which is called "eight characters" for short. At this time, it is 165438+ 10/5, 2005 (October 14th of the lunar calendar). The horoscope of the person born at this time is the year of Yiyou, and the date of Guimao in Dinghai is Ren Xu (because it is decyl on that day, it is calculated that it is 65438 when the child is a child today.