UTC is the time standard commonly used across the world since It is used in many technical fields, like aviation industry and meteorologists, also used to synchronize time across internet networks. It is now often used to refer to Coordinated Universal Time UTC when this is viewed as a time zone, and in casual use for the most parts it is the same.
In military GMT is known as Zulu time. Include Time. Include Date. Universal Time Coordinated. Greenwich Mean Time. United Kingdom. GMT timezone map. London Information. Daylight Saving Time Change. Daylight Saving Time Starts. Find out more about the Airy Transit Circle.
The Shepherd gate clock can be seen at the gates to the Royal Observatory. It was the first clock ever to show Greenwich Mean Time directly to the public.
It is a 'slave' clock, connected to the Shepherd master clock which was installed at the Royal Observatory in From that time until , the Shepherd master clock was the heart of Britain's time system. Its time was sent by telegraph wires to London, Edinburgh, Glasgow, Dublin, Belfast and many other cities. By , time signals were also sent from the clock to Harvard University in Cambridge, Massachusetts via the new transatlantic submarine cable.
In terms of the distribution of accurate time into everyday life, it is one of the most important clocks ever made.
The first thing you notice about the clock is that it has 24 hours on its face rather than the usual That means at 12 noon the hour hand is pointing straight down rather than straight up. The clock originally indicated astronomical time, in which the counting of the 24 hours of each day starts at noon.
The clock was changed in the 20th century to indicate Greenwich Mean Time, in which the counting of the 24 hours of each day starts at midnight. Learn the story of Greenwich Mean Time in our publications. Keep track of time with our famous Shepherd Gate clock replica for your wall.
Visit us. Royal Observatory. Plan your visit. Top things to do. Discover gifts from the home of time Learn the story of Greenwich Mean Time in our publications. An autumnal photograph of the Prime Meridian of the World.
As the reference for GMT Greenwich Mean Time , the Prime Meridian at Greenwich became the centre of world time and the basis for the global system of time zones in Buy Now.
A stylish hour analogue clock that will make a statement on any wall, with its bold monochrome face, and matte black metal casing How old is Earth? How fast can you think? How long is a light year and how short is a femtosecond? What does Greenwich Mean Time mean? Can you tell the time with flowers? When did time begin? This light-hearted, illustrated miscellany from Royal Observatory Greenwich goes a long way to answering some of these questions and also presents a whole range of other amazing facts and figures which show the influence of time on our daily lives Visit Us.
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