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Greenwich Mean Time

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The origins of the Greenwich Meridian | Greenwich Mean Time | Place in History | 1974

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Charlotte Gainsbourg - Greenwich Mean Time (Official Audio)

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Title Fight - GMT (Greenwich Mean Time)

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Why The Prime Meridian Isn't At 0º

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GREENWICH MEAN TIME

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London, reckoned from midnight. At different times in the past, it has been calculated in different ways, including being calculated from noon; as a consequence, it cannot be used to specify a precise time unless a context is given.
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  • History 

  • Ambiguity in the definition of GMT 

  • United Kingdom 

  • Other countries 

  • Time zone 

  • Discrepancies between legal GMT and geographical GMT 

  • Countries and areas west of 22°30'W ("physical" UTC−2) that use UTC 

  • Countries and areas west of 7°30'W ("physical" UTC−1) that use UTC 

  • Countries (mostly) between meridians 7°30'W and 7°30'E ("physical" UTC) that use UTC+1