1, in the morning, refers to the period from midnight 12 to noon 1 1: 59, and also refers to the period from 9 am to 1 1:00.
2. At noon, in ancient China, the day was divided into twelve o'clock, and the noon of modern 24-hour system was from 1 1:00 to 13:00.
3. In the afternoon, compared with the morning, the period from noon 12 to 18 generally refers to the period from noon 12 to sunset.
Introduction at twelve o'clock
The ancient working people divided a day and night into twelve periods, and each period was called an hour. 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 the 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.
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." 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".
12 hour is equivalent to 24 hours and 2 hours per hour.