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:
“He certainly must be a son of Aurora to whom the sun looms, when there are so many millions to whom it glooms rather, or who will never see it till an hour after it has risen. But it behooves us old stagers to keep our lamps trimmed and burning to the last, and not trust to the sun’s looming.”
—Henry David Thoreau (1817–1862)
“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)
“They shift coffee-houses and chocolate-houses from hour to hour, to get over the insupportable labour of doing nothing.”
—Richard Steele (1672–1729)