Divide 9- 1 1 time period into three equal parts, and the first, middle and not are three points respectively.

Time division:

When the child is 23 ~1,when the clown is1~ 3, when the yin is 3 ~ 5, when the Mao is 5 ~ 7, when the morning is 7 ~ 9, when the hour is 9 ~1,when the noon is/kloc-0. When the application time is15 ~17, when the unitary time is17 ~19, when it is19 ~ 21,the sea time is 2/kloc-0.

Ancient time calculation:

In ancient China, people used the method of "copper pot dripping" to measure time, and divided a day and night into twelve hours, namely, Zi, Ugly, Yin, Mao, Chen, Si, Noon, Wei, Shen, You, Xu and Hai, which correspond to the twenty-four hours today.

From eleven o'clock to one o'clock in the middle of the night, it's ugly from one to three o'clock, yinshi from three to five o'clock, and so on. An hour in ancient times was equivalent to two hours today. Therefore, when clocks and watches were just introduced into China, some people called an hour "Da Shi" and an hour in the new time "Hour".