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:

    Under certain circumstances there are few hours in life more agreeable than the hour dedicated to the ceremony known as afternoon tea.
    Henry James (1843–1916)

    I promise you, but for your company,
    I would have been a-bed an hour ago.
    William Shakespeare (1564–1616)

    ‘Tis but an hour ago since it was nine,
    And after one hour more ‘twill be eleven,
    And so from hour to hour, we ripe and ripe,
    And then from hour to hour, we rot and rot;
    And thereby hangs a tale.
    William Shakespeare (1564–1616)