Shi Si means 9: 00 am to 0: 00 noon. For example, "Huainanzi Astronomical Training" says: "As for Hengyang, the sun is in the corner." So it used to be called the corner.

Read at twelve o'clock: Zi (zǐ), Ugly (chǒu), Yin (yín), Mao (m ǐ o), Chen (chén), Si (s), Wu (), Wei (wèi) and Shen (shēn).

Twelve o'clock was originally created by the ancients according to the natural laws such as the appearance and appearance of the sun, the change of the sky and their daily production activities and living habits.

The twelve o'clock clock 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 China's splendid cultural treasures.

Extended data

The ancient working people divided a day and night into twelve periods, and each period was called an hour. Twelve o'clock can refer to either 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 and their daily production activities and living habits.

This is the twelve-hour system used in the Western Zhou Dynasty. In the Han Dynasty, it was named Midnight, Crow, Pingdan, Sunrise, Food Time, Horn, Japan-China, Sundial, Sunset, Dusk and Man's Decision. 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.

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: "Give it to me drunk, and give it to me 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.

12 hour is equivalent to 24 hours and 2 hours per hour.

References:

Baidu encyclopedia-time

References:

Baidu encyclopedia-twelve o'clock