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 HourEtymology, History, Counting Hours, Derived Measures and Applications

Other articles related to "hour, hours":

Hour - Derived Measures and Applications
... per second, in everyday usage kilometres per hour or, in the USA and the UK, miles per hour are more practical ... Occasionally the metre per hour is used for slow-moving objects like snails ... Worker compensation is commonly based on working time in terms of number of hours worked, referred to as an hourly wage ...
Rush Hour
... A rush hour or peak hour is a part of the day during which traffic congestion on roads and crowding on public transport is at its highest ...
KYW (AM) - Station Identifications - KYW Jingle
... At the top of every hour, a recording of Dick Covington (who died in 2004 all other station imaging is done by Sean Caldwell) is played announcing ... and Delaware." At 02, 12, 22, 32, 42 and 52 after the hour, traffic transit reports ("on the twos") are introduced with car horns sounding the first five notes ... At 30 past the hour, the recording is slightly different, with Covington announcing that "the newswatch never stops" (borrowed from sister station WINS ...
Miles Per Hour
... Miles per hour is an imperial unit of speed expressing the number of statute miles covered in one hour ... case by examining speeds in both kilometres per hour and miles per hour ... common unit of speed one knot is one nautical mile per hour ...
PortAventura Park - Major Rides
... Shambhala Expedición al Himalaya Bolliger Mabillard 83 miles per hour (134 km/h) 249 feet (76 m) 5,410 feet (1,650 m) 2012 Dragon Khan Bolliger Mabillard 65 miles per hour (105 km/h ...

Famous quotes containing the word hour:

    The hour when you say, “What does my justice matter? I do not see that I am embers and coals. But the just are embers and coals!”
    Friedrich Nietzsche (1844–1900)

    The hour when you say, “What does my reason matter? Does it crave knowledge as a lion craves its food? It is poverty and filth, and a wretched complacency!”
    Friedrich Nietzsche (1844–1900)

    For my father, who used to sit, hour after hour, night after night, outside our house in Africa, watching the stars “Well,” he would say, “if we blow ourselves up, there’s plenty more where we came from!”
    Doris Lessing (b. 1919)