? 2. Twelve o'clock: twelve o'clock system. It was 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.
Twelve o'clock consists of twelve specific time nouns. People can trace the origin of these words from the ancient books of the Han nationality 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 clock is unique and has a long history. It is an outstanding contribution of Han nationality to human astronomical calendar 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: "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.