The hour (common symbol: h or hr) is a unit of measurement of time. In modern usage, an hour comprises 60 minutes, or 3,600 seconds. It is approximately 1/24 of a mean solar day.
An hour in the Universal Coordinated Time (UTC) time standard can include a negative or positive leap second, and may therefore have a duration of 3,599 or 3,601 seconds for adjustment purposes.
Although it is not a standard defined by the International System of Units, the hour is a unit accepted for use with SI, represented by the symbol h.
Read more about Hour: Etymology, History, Counting Hours, Derived Measures and Applications
Famous quotes containing the word hour:
“What monster have we here?
A great Deed at this hour of day?
A great just Deed—and not for pay?
Absurd,—or insincere.”
—Elizabeth Barrett Browning (1806–1861)
“It is the hour when stink and sweat
Subside to let the flesh forget
Affinity for brick and lathe,
The cold necessity to bathe
And certain things one would forget.”
—Allen Tate (1899–1979)
“To quarrel with the uncertainty that besets us in intellectual affairs would be about as reasonable as to object to live one’s life with due thought for the morrow because no man can be sure he will alive an hour hence.”
—Thomas Henry Huxley (1825–95)