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:

    My lord, the crown which I have borne so long has given enough of vanity in my time. I beseech you not to augment it in this hour when I am so near my death.
    Elizabeth I (1533–1603)

    ...I never drink wine ... I keep my hands soft and supple ... I sleep in a soft bed and never over-tire my body. It is because when my hour strikes I must be a perfect instrument. My eyes must be steady, my brain clear, my nerves calm, my aim true. I must be prepared to do my work, successfully if God wills. But if I perish, I perish.
    Lisa, Russian terrorist (anonymous)

    To-morrow, and to-morrow, and to-morrow,
    Creeps in this petty pace from day to day
    To the last syllable of recorded time,
    And all our yesterdays have lighted fools
    The way to dusty death. Out, out, brief candle!
    Life’s but a walking shadow, a poor player
    That struts and frets his hour upon the stage
    And then is heard no more: it is a tale
    Told by an idiot, full of sound and fury,
    Signifying nothing.
    William Shakespeare (1564–1616)