A traditional unit of time in China. Divide one day and night into twelve TCM health preserving periods, each period is called one hour, which is now two hours. Twelve o'clock is named after the earthly branches, namely, Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai. From midnight, it is midnight to 1 point and noon to 1 point. Specifically: 23 ~ 1 o'clock in the morning, 1 ~ 3 o'clock in the morning, 3 ~ 5 o'clock in the afternoon, 5 ~ 7 o'clock in the morning, 7 ~ 9 o'clock in the morning, 9 ~1o'clock in the afternoon, 165438. Joint time 17 ~ 19, Chu time 19 ~ 2 1 point, sea time 2 1 ~ 23.

An hour is a unit of time, which is a quarter of the average solar day. One hour is generally equal to 3600 seconds, or 60 minutes, or 1/24 days.