Hour

The hour (symbol: h) is a unit of measurement used to measure time. The hour is equal to sixty minutes. Twenty-four hours are equal to one day. Unlike the second, the hour is not a base SI unit.

Hour Media

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  Midnight to 1 a.m. on a 24-hour clock with a digital face

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  A 7th-century Saxon tide dial on the porch at Bishopstone in Sussex, with larger crosses marking the canonical hours.

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  Planispheric astrolabe designed for the latitude of Varese (Italy)

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  Sundial with Italian hours in Asti

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  A Chinese diagram from Su Song's AD 1092 Xinyi Xiangfa Yao illustrating his clocktower at Kaifeng.

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  A reconstruction of another kind of Chinese clepsydra in Beijing's Drum Tower

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  Two of the deified Hours of the Greeks and Romans