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:
“We should not say that one man’s hour is worth another man’s hour, but rather that one man during an hour is worth just as much as another man during an hour. Time is everything, man is nothing: he is at the most time’s carcass.”
—Karl Marx (1818–1883)
“The hour of departure has arrived, and we go our ways—I to die and you to live. Which is the better, only God knows.”
—Socrates (469–399 B.C.)
“O love, if I regret the age when one savors you, it is not for the hour of pleasure, but for the one that follows it.”
—Jean-Jacques Rousseau (1712–1778)