Hours in a Day
Begining of a Day
A day begins at mid-night
Double-Hour
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.
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
Names of Double-hours
Are double-hours still in use?
No. Their use is limited to Bagua and Chinese zodiac.
Calendar page
Plotting like a clock, it looks like this:
