Shi Mao refers to 5-7 in the morning, when the sun rises, the yin gradually disappears, the sun rises and everything starts to move. Mao is a hieroglyph, just like the shape of two doors open. Its original meaning is that the door is open, which means starting a new day.
Shi Mao, sunrise, also known as the beginning of the day, dawn, sunrise and so on. Divide a day and a night into twelve time periods, each time period is called one hour, and one hour is two hours today. 12 hour clock
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. 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.
The origin of time
In ancient China, the segmented timing system based on the movement of the sun and the moon, the customs of human life and the laws of production activities was the oldest ancient timing method. Under the subsection timing system, the most familiar "twelve-hour system" came into being after Emperor Wu of the Han Dynasty first changed the calendar, and was first put forward by astronomers who participated in the calendar change at that time.
The origin of the twelve-hour system can be traced back to the Spring and Autumn Period and the Warring States Period. People began to apply the calendar name of 65438+ February to astronomical orientation. North is the child position, south is the noon position, east is the base position, and west is the unitary position. Day and night, the sun moves in the direction of 12 and returns to its original place, thus producing the concept of one-hour positioning of the sun.