Hour

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:

    In the hour of my distress,
    When temptations me oppress,
    And when I my sins confess,
    Sweet Spirit comfort me!
    Robert Herrick (1591–1674)

    Yes, it is the hour at which, long ago, I felt happy. What always awaited me then was a light and dreamless sleep. But something had changed because, with the wait for tomorrow, it is my cell that I have found. As if the familiar paths traced in the summer skies could lead to prisons as well as innocent slumbers.
    Albert Camus (1913–1960)

    My father and mother in 1817 were forty-nine days on the road with their emigrant wagons [from Vermont] to Ohio. More than two days for each hour that I spent in the same journey.
    Rutherford Birchard Hayes (1822–1893)