In ancient times, a day and night was divided into twelve hours, that is, one hour was equivalent to two hours, and the corresponding relationship between twelve hours and twenty-four hours was: 1 to 3 o'clock. Starting from Jiazi Day, the time branches of this day are Jiazi, Picnic, Bingyin, Ding Mao, Chen Wu and Keith in turn, and the cycle continues according to 60 Jiazi.
The ancients also summed up a formula as follows: a plus a, b plus c for the first time. Bing Xin starts from E and lives in Geng Zi. How can I get rid of it? That means, Aji's daily working hours are Jiazi, Ugly B and Yin C, while Geng B's daily working hours are Bingzi, Ugly D and Yin E, while Xin C's daily working hours are Wuzi, Ugly D and Yin E, and Ding Ren's daily working hours are Renzi, Ugly D and Yin A.. In other words, it only happens in Aji or Jizi.
About twelve o'clock
The twelve o'clock system has been in use since the Western Zhou Dynasty. In the Han Dynasty, it was named Midnight, Cockcrow, Pingdan, Sunrise, Food Time, Gala, Japan-China and Sunset.
Later, the day and night were divided into twelve hours, which were represented by the names of the twelve earthly branches and the word "time", namely, Zishi, Choushi, Yin Shi, Shi Mao, Chen Shi, Shi Si, Noon, Weishi, Shenshi, Youshi, Xushi and Shihai, and each time was equivalent to two hours today. The relationship between twelve o'clock and the current timing method is: midnight -23: 00 to 1: 00, clown-1: 00 to 3: 00, Yin Shi -3: 00 to 5: 00, etc. For example, the current time is 2 1: 00 to 23: 00.
The above contents refer to Baidu Encyclopedia-Ugly Time.