From eleven to midnight, it's ugly from one to three, Yin Shi from three to five, and so on. One hour in ancient times is equivalent to two hours today. So when clocks and watches were first introduced into China, some people called an hour "Da Shi" and an hour in the new time "Shi".
Later, with the popularity of clocks and watches, the word "big hour" disappeared, but "hour" has been used to this day.
Sculpture-Ancient time was measured by clepsydra.
The leaky pot is divided into two parts: the sowing pot and the receiving pot. The seeding kettle is divided into two or four layers, both of which have dripping holes, and finally flow into the receiving kettle. The kettle has an upright arrow engraved with 100 minutes. The arrow gradually rises with the storage of water, showing the number of minutes to show the time.
And a 24-hour day and night is 100 minutes, which is equivalent to 1440 minutes now. It can be seen that each moment is equivalent to 14.4 minutes now. So "3: 30 noon" is equivalent to 1 1: 43.2 at noon now.
Extended data
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. 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.
Midnight, also known as midnight and midnight: the first hour of twelve o'clock. (23: 00 to 0 1 hour).
Ugly cock crow, also known as pheasant: the second hour of twelve o'clock. (0 1 to 03: 00).
Yin Shiping Dan, also known as Dawn, Dawn and Sundan, etc. Time is the alternation of day and night. (03 o'clock to 05 o'clock).
Sunrise in Shi Mao, also known as the beginning of the day, dawn and rising sun, refers to the time when the sun just appeared and Ran Ran first rose. (05: 00 to 07: 00)
When eating in the morning, it is also called breakfast. When the ancients ate in the morning, it was breakfast time (07:00 ~ 09:00).
Forty holes, also known as Yu Ri, etc. : near noon, call the corner. (09: 00 to 1 1: 00).
Noon noon, also known as the sun, noon, etc. : (1 1 to 13).
Sunset, also known as sunset, the center of the sun, etc. To the west of the sun is a sundial. (from 13 to 15).
The time of application, also known as day shop, dinner, etc. : (15: 00 to 17: 00).
As time goes by, it is also called sunset, sunset and evening: it means when the sun goes down. (from 17 to 19).
Dusk, also known as sunset, sunset glow, dusk, etc. At this time, the sun has set and the sky will be dark. The world is dark and everything is hazy, so it is called dusk. (from 19 to 2 1).
At this time, it was already late at night, and people stopped their activities and had a rest. Calm means quiet. (2 1 to 23: 00).
reference data
Baidu encyclopedia time