When is the Gregorian calendar?

Shi Mao: 5: 00 to 7: 00; Time: 9 ~11; Morning: 7 ~ 9 o'clock

The ancient working people divided a day and night into twelve periods, each of which was called an hour. Twelve o'clock can mean a day or any time.

Twelve o'clock was created by the ancient working people in China according to the natural laws of the sun, the changes of the sky, daily production activities and living habits.

12 hour system It was used in the Western Zhou Dynasty. In the Han dynasty, it was named midnight, crow, pingdan, sunrise, food time, corner, day, sundial, sunset, dusk and people's decision. It is also represented by the twelve earthly branches, with the midnight from 23: 00 to 1: 00 as the sub-hour, 1: 00 to 3: 00 as the sub-hour, and 3: 00 to 5: 00 as the Yin Shi time, which are circulated in turn.

Extended data:

Twelve o'clock consists of twelve specific time nouns. People can trace the origin 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 had been implementing the taichu calendar Law. "Twelve o'clock a day, the main subject is the subject." (Zhao Yi's Examination of Jade Cong (Volume 34) was basically finalized and named. 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". The earliest example of people using "midnight" as a time noun can be found 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 for regimen and popularizing scientific regimen, which is undoubtedly of revolutionary significance for improving people's physique and improving people's quality of life.

Refer to Baidu Encyclopedia-Twelve o'clock