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The first was that the USA had already chosen Greenwich as the basis for its own national time zone system. As the reference for GMT, the Prime Meridian at Greenwich therefore became the centre of world time and the basis for the global system of time zones.
Therefore this also became the start of the Universal Day. The meridian line is marked by the cross-hairs in the Airy Transit Circle eyepiece. 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. While this was not immediately put into action, he continued to agitate in this direction and eventually the theory of a universal day beginning at Greenwich midnight, but not interfering with local or standard time where appropriate, was agreed upon by the International Meridian Conference.
By the s most countries had adopted hourly time zones, but in some instances these differed within regions because of geography, distance or politics. This remains the case today, with a number of countries carrying different time zones between states. Some countries including China use a single time zone despite spanning more than 15 degrees of longitude.
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