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What Are Zi Hour and Hai Hour? The Relationship Between Births at Zi Hour and Hai Hour
Published: 2026/01/16   Author: liao   Source: network
The 12时辰 system. It was already in use during the Western Zhou Dynasty. In the Han Dynasty, it was named as: Night Half, Cock Crowing, Dawn, Sunrise, Meal Time, Corner Midday, Midday, Afternoon Sun, Late Afternoon, Sunset, Dusk, and Quiet Night. It also used the Twelve Earthly Branches to represent these times, with the time from 23:00 to 1:00 at night being called Zi Hour, 1:00 to 3:00 being Chou Hour, 3:00 to 5:00 being Yin Hour, and so on. So what are the times for Zi Hour and Hai Hour? What is the relationship between birth during Zi Hour and Hai Hour?

Zi Hour and Hai Hour: What are they?

【Zi Hour】: 21:00-01:00
Night Half, also known as midnight or middle night: The first of the twelve hours.
【Hai Hour】: 21:00-23:00
Qiandun, also known as Dinghun, meaning the time when the night is deep and people have stopped their activities and are resting and sleeping. Qiandun means quietness.

The relationship of birth during Zi Hour and Hai Hour

【Zi Hour】: It represents "child." Like a child in a cradle. The original meaning of "zi" is "small" or "egg." In ancient times, it referred to children. From 23:00 to 1:00 is the Zi Hour, which is the deep midnight, the threshold between today and tomorrow, and can be said that the "child" of tomorrow is about to be born or is already in the cradle. The Zi Hour is a moment of incubation and hatching.
【Hai Hour】: Some say it resembles a pig, a variant of the character "shu." There is also a theory about roots. From 21:00 to 23:00, the sound of pigs rummaging in the trough wakes up the person—-to make the pigs fat, one must get up at midnight to feed them. Additionally, the root and tuber of plants are related to the feed for pigs.
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