What time is the fourth day? What time is the fourth day?

1 and d refers to 9: 00 am to 1 1. 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. 12 hour is equivalent to 24 hours and 2 hours per hour. It is clearly pointed out in the New Tang Calendar that "the ancient calendar divides the day and begins at midnight", and the midpoint of midnight, that is, today's zero hour (24: 00), is the beginning of the day.

2. Twelve-hour system. It was used in the Western Zhou Dynasty. The Han Dynasty named it Midnight, Crow, Pingdan, Sunrise, Food Time, Corner, Japan, China, Sun, Sun, Dusk and Man. 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.