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en.wikipedia.org/wiki/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. English speakers often use GMT as a synonym for Coordinated Universal Time ...

greenwichmeantime.com

Clock changes made easy . Compare your local time with European clocks or with USA and Canada clocks now on Daylight Saving Time (DST). Try other regions too or just compare your local time with GMT. .. You have arrived at a site with a world-famous name. What is Greenwich Mean Time (GMT) ?

www.timetemperature.com/time-zone-maps/world-time-zone-map...

Time zones to the east of the Greenwich meridian are later and times to the west of the Greenwich meridian are earlier. To see more detail view our larger format world time zone map. EXPAND THE WORLD TIME ZONE MAPS. This world time zone map shows the division of the world into twenty four time zones of 15 degrees longitude each. However, if you ...

www.timeanddate.com/time/zones/gmt

An email sent from someone in the Greenwich Mean Time (GMT) time zone will have the time zone listed as "+0000" in the headers of the email. (However, "+0000" does not have to be in Greenwich Mean Time, as other time zones could have the same UTC offset).

greenwichmeantime.com/what-is-gmt

Greenwich Mean Time or GMT is clock time at the Royal Observatory in Greenwich, London. It is the same all year round and is not affected by Summer Time (Daylight Saving Time) clock changes. When the sun is at its highest point exactly above the Prime Meridian , it is 1200 noon at Greenwich.

www.rmg.co.uk/discover/explore/prime-meridian-greenwich

Why does the Prime Meridian run through Greenwich? There were two main reasons for the choice. The first was the fact that the USA had already chosen Greenwich as the basis for its own national time zone system. The second was that in the late 19th century, 72% of the world's commerce depended on sea-charts which used Greenwich as the Prime ...

en.wikipedia.org/wiki/Time_zone

In 1879 he specified that his universal day would begin at the anti-meridian of Greenwich (180th meridian), while conceding that hourly time zones might have some limited local use. He also proposed his system at the International Meridian Conference in October 1884, but it did not adopt his time zones because they were not within its purview.

www.reference.com/science/greenwich-meridian-f657acf27cfa0c42

The Greenwich Meridian also establishes the International Date Line and the Coordinated Universal Time. There are 24 different times zones in the world, all of which have been measured based on the UTC. The International Date Line is measured at 180 degrees longitude from the Greenwich Meridian.

science.howstuffworks.com/.../everyday-myths/time3.htm

All time zones are measured from a starting point centered at England's Greenwich Observatory. This point is known as the Greenwich Meridian or the Prime Meridian.Time at the Greenwich Meridian is known as Greenwich Mean Time (GMT) or Universal Time.The Eastern time zone in the United States is designated as GMT minus five hours.

www.rmg.co.uk/discover/explore/greenwich-mean-time-gmt

Greenwich Mean Time is the yearly average (or ‘mean’) of the time each day when the Sun crosses the Prime Meridian at the Royal Observatory, Greenwich. Find out about the Prime Meridian Essentially , mean time is clock time rather than solar (astronomical) time.