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 World Time and Clocks - Clocks are found all over the world and all tell you the same thing wherever you live. We've gathered information about world time and clocks. Things like daylight savings time, world time zones, atomic clocks & more.
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The GMT is measured from the Greenwich Meridian Line at the Royal Observatory in Greenwich. It is the place from where all time zones are measured.
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This page is a near duplicate of the more popular title Greenwich Time because the page titles should be about the same topic.
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GMT (GMT)
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GMT - The Prime Meridian Line
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Greenwich Mean Time is a term originally referring to mean solar time at the Royal Observatory, Greenwich in England.
It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, although strictly
UTC is an atomic time scale which only approximates GMT in the old sense. It is also used to refer to Universal Time,
which is the astronomical concept that directly replaced the original GMT.
Historically the GMT has been used with two different conventions for numbering hours. The old astronomical
convention (before 1925) was to refer to noon as zero hours, whereas the civil and more modern convention is to refer to
midnight as zero hours. The more specific terms UT and UTC do not share this ambiguity, always referring to midnight as
zero hours. Wikipedia
Greenwich, England has been the home of Greenwich Mean Time (GMT) since 1884. GMT is measured from the Greenwich
Meridian Line at the Royal Observatory in Greenwich. It is the place from where all time zones are measured. World Time Zones
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The most relevant links we could find, placed here free
 Greenwich2000®
- Check the current GMT. wwp.greenwichmeantime.com
World Time Zones
- The current time anywhere in the world. www.worldtimezones.com
Wikipedia
- Information about the Coordinated Universal Time (UTC). en.wikipedia.org
About
- "Understanding and Reading UTC or GMT Time", an article about GMT and differences with UTC. weather.about.com
Royal Observatory Greenwich
- Site of the Royal Observatory in Greenwich, UK. Check highlights, history and more information. www.nmm.ac.uk
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GMT
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Greenwich Mean Time (GMT) began in the 19th century for use in British maritime navigation. Greenwich, England was
established as the Prime Meridian with a longitude of zero.
While the UTC time was based on GMT time, there are two main differences between the two. UTC time is based on
midnight while GMT is based on noon. Another difference between UTC and GMT time is that GMT is based on Earth's
rotation and celestial measurements, UTC is a based on cesium-beam atomic clocks.
GMT (GMT) is also known as Zulu Time
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The Royal Observatory
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Site written by Edoardo Salazar