Greenwich Mean Time
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Time Websites

Royal Observatory Greenwich

From sundials to research on time

  • The Royal Observatory Greenwich has a wide-ranging treasure trove of information on time & Astronomy.

Clocks

  • British Horological Institute - packed full of materials and links

Sundials

  • The Sundial Trail at the Horniman Museum in London, England a comprehensive information site from the British Sundial Society

  • The North America Sundial Society

Time Research

  • Compute Local Apparent Sidereal Time that is the actual time for your spot on the globe in relation to Greenwich. Outside the USA you will have to know your longitude (that's the East, West one!). Greenwich is at zero degrees Prime Meridian of the World.

Clocks and Time Tools

Clocks showing different times
Time ConverterCompare cities or time zones across the world
Clocks around the world
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World map
ConversionsWhat is the GMT/UTC time difference?

Our creative collection

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Roman Numerals IV & IIII
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Greenwich Time Ball
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Summer Time
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UTC
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