Time is an ancient unit of time. The ancients divided a day into twelve hours, and each hour is equal to two hours now. According to legend, each time is named after the time of animals in the zodiac.

In ancient China, the method of "dripping water from a copper pot" was used to measure time, and one day and night were divided 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 to midnight, it's ugly from one to three, Yin Shi from three to five, and so on.

One hour in ancient times is equivalent to two hours today. So when clocks and watches were first introduced into China, some people called an hour "Da Shi" and an hour in the new time "Shi". Later, with the popularity of clocks and watches, the word "big hour" disappeared, but "hour" has been used to this day.

Extended data

This is the twelve-hour system used in the Western Zhou Dynasty. The Han Dynasty named it Midnight, Crow, Pingdan, Sunrise, Food Time, Corner, Japan, China, Sun, Sun, Dusk and Man. It is also expressed by the twelve earthly branches, and it is the child time from 23: 00 to 1 at midnight, the ugly time from 1 to 3: 00, and the Yin Shi time from 3: 00 to 5: 00, which are recursive in turn.

Twelve o'clock consists of twelve specific time nouns. People can find the source of these words from the ancient books of China in the pre-Qin period. Before the Han Dynasty, these appellations were different. Until the early Han Dynasty, China implemented the taichu calendar Law. "Twelve o'clock a day, the main branch is the subject." (Zhao Yi's Examination of Jade Cong, Volume 34) Basic stereotypes and naming.

The twelve o'clock calendar is unique and has a long history. It is an outstanding contribution of the Chinese nation to the astronomical calendar of mankind and one of the splendid treasures of Chinese culture.

The first hour of twelve o'clock is called "midnight". People take "midnight" as an example of time noun, which was first seen in Zuo Zhuan's Sixteen Years of Mourning for the Duke: "Send it drunk, and send it at midnight."

At twelve o'clock, the twelve-point regimen of Huangdi Neijing is integrated into people's daily life through timing tools, reminding people of scientific regimen at any time and letting everyone know how to use Huangdi Neijing to carry out regimen and popularize scientific regimen, which is undoubtedly of revolutionary significance for improving people's physique and improving people's quality of life.