Sunrise to sunset was divided into twelve parts, as was sunset to sunrise. The length of each of these hours varied according to the length of day or night.
I think this goes back to ancient Babylonian times. Certainly the idea of a 12 hour day and a 12 hour night is very ancient.
hot in the day time cold in the night
The ancient Egyptian water clock was made to count the hours of the night and to count how long a person speaks in a trial.
The London Opium Den in the environs of Covent Garden / Soho is reckoned to be the 1st night Club in the UK. Prostitution & the use of Opium from China was encouraged there.
A day is 12 hoursA night is 12 hours
12hours in a day and 12 hours in a night
The duration of Monster Night is 1.5 hours.
The duration of Fright Night is 1.77 hours.
There are 4.9625 hours in one night on Jupiter.
about 10 hours
Not Enough Hours in the Night was created on 1995-10-09.
The duration of That Night is 1.48 hours.