Hours in a Day
Begining of a Day
By the convention of the current International practice, each day begins at mid-night.
Traditionally, and going back for thousands of years and long before
the invention of mechanical clocks, a day is divided into 12
equal intervals. Each interval is thus 2 hours long, and may
be called a 'double-hour.'
First Double-hour of a Day
The first double-hour begins at 11 p.m. of the previous night,and
spans just one hour of the begining of the day.
The 2nd double-hour spans 1 - 2 a.m.
Names of Double-hours
Are double-hours still in use?
The 3rd double-hour spans 3 - 4 a.m.
The 6-th double-hour spans 11 a.m. - 1 p.m.
The 11-th double-hour spans 1-11 p.m.
The 12-th double-hour spans 11 p.m. to the first hour os the next day
Note: By the current international convention, each day begins after
the mid-night hour, which is 12 hours after the mid-day noon. In the traditional Chinese convention, as
described here, each day begins 11 hours after the mid-day noon of the
It should be noted that in certain other calendars, the day may begin at Sun Down, rahter
than at mid-night.
No. Their use is limited to Bagua and Chinese zodiac.