Twelve-hour system and twenty-four-hour system
After the Song Dynasty, every 20 hours were divided into two parts, namely, the beginning of the child, the beginning of the child, the beginning of the ugly, and the beginning of the ugly ... in turn, it was exactly 24 hours, which is consistent with the current 24 hours a day. The Western Zhou Dynasty used the twelve o'clock system, and the Han Dynasty named it Midnight, Cockcrow, Pingdan, Sunrise, Food Time, Corner, Japan, China, Sundial, Dawn, Dusk, and People Decided.
Time health song
Yin got up at dawn and went downstairs with a cup of boiling water;
It's so light to go to the toilet regularly, and the morning exercise in gross time is the most pleasant;
When I was reading and playing with my young grandchildren, when I was a chef, I became a kitchen master.
Drink less wine at noon and take a lunch break before noon;
Shen Shi reads newspapers and writes poems, and watches clouds outdoors;
CCTV news has arrived, close your eyes and listen to rest;
Wash your face in the middle of the stone sea and enter the painting picture in your childhood dream;
When you are ugly, you wake up, you bleed, and you bleed.
Blood flow, quiet inside, sleep till the rooster crows the dawn.