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At one time, the most accurate time update was the daily observation of when the sun was at its highest point in the sky as seen from the observatory at Greenwich, England. After the daily observation telegraphs would then be sent to other cities so they could synchronize their clocks. This "precise" time reference is what was known as Greenwich Mean Time (GMT) (mean is a synonym of average).
Today we use atomic clocks to accurately keep track of the passage of time. The name for the official standard by which time is measured around the world is Coordinated Universal Time (UTC). The time in any time zone can be expressed as an offset from UTC. For example, Pacific Daylight Saving Time in North America (PDT) is UTC - 7 hrs. or UTC-7, and Western Standard Time in Australia (WST) is UTC + 8 hrs. or UTC+8.
Because of the different ways at which they are arrived, Coordinated Universal Time and Greenwich Mean Time do not mean exactly the same thing, so it is no longer proper to define the time in a certain time zone by its offset from GMT.
The time in England, including London and Greenwich, is 1 hr. ahead of UTC from the last Sun. of March until the last Sun. of Oct. and is referred to as British Summer Time (BST). England is on GMT the rest of the year.
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What is the time difference between Perth Australia and London England using GMT?
London, England is at (Greenwich Mean Time) GMT. Perth, Australia is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England.
What time difference is there from London to buenos aires?
England (London) is at (Greenwich Mean Time) GMT. Buenos Aires is (Greenwich Mean Time) GMT -3 hours, ie. 3 hours behind Greenwich, England. Buenos Aires is 3 hours behind London. (Daylight savings not taken into account.)
How many hours different between Jakarta and London?
England (London) is at (Greenwich Mean Time) GMT. Jakarta is (Greenwich Mean Time) GMT +7 hours, ie. 7 hours ahead of Greenwich, England. London is 7 hours behind Jakarta. (Daylight savings not taken into account.)
You say Time difference London to Cairns is 11 hours Does that mean we are 11 hours behind them or 11 hours in front?
England (London) is at (Greenwich Mean Time) GMT. Cairns is (Greenwich Mean Time) GMT +10 hours, ie. 10 hours ahead of Greenwich, England. London is 10 hours behind Cairns. (Daylight savings not taken into account.)
What is the time difference between NZ and England today?
England is at (Greenwich Mean Time) GMT. New Zealand is (Greenwich Mean Time) GMT +12 hours, ie. 12 hours ahead of Greenwich, England. England is 12 hours behind New Zealand. (Daylight savings not taken into account.)
What is the time difference between Perth Australia and London England using GMT?
London, England is at (Greenwich Mean Time) GMT. Perth, Australia is (Greenwich Mean Time) GMT +8 hours, ie. 8 hours ahead of Greenwich, England.
Is there a time difference between London and Vienna?
Yes. London has GMT (Greenwich Mean Time), Vienna has CET (Central European Time). The resulting time difference is one hour.
What time difference is there from London to buenos aires?
England (London) is at (Greenwich Mean Time) GMT. Buenos Aires is (Greenwich Mean Time) GMT -3 hours, ie. 3 hours behind Greenwich, England. Buenos Aires is 3 hours behind London. (Daylight savings not taken into account.)
How many hours different between Jakarta and London?
England (London) is at (Greenwich Mean Time) GMT. Jakarta is (Greenwich Mean Time) GMT +7 hours, ie. 7 hours ahead of Greenwich, England. London is 7 hours behind Jakarta. (Daylight savings not taken into account.)
What is the time difference between Greenwich Mean Time and the Canary Islands?
none
What is the time difference between London and Mombasa?
England (London) is at (Greenwich Mean Time) GMT. Mombasa is (Greenwich Mean Time) GMT +3 hours, ie. 3 hours ahead of Greenwich, England. Mombasa is 3 hours ahead of London. (Daylight savings not taken into account.)
You say Time difference London to Cairns is 11 hours Does that mean we are 11 hours behind them or 11 hours in front?
England (London) is at (Greenwich Mean Time) GMT. Cairns is (Greenwich Mean Time) GMT +10 hours, ie. 10 hours ahead of Greenwich, England. London is 10 hours behind Cairns. (Daylight savings not taken into account.)
Famous city with the letter g?
Greenwich, in London, after which Greenwich Mean Time (GMT) is named.
What is the time difference between NZ and England today?
England is at (Greenwich Mean Time) GMT. New Zealand is (Greenwich Mean Time) GMT +12 hours, ie. 12 hours ahead of Greenwich, England. England is 12 hours behind New Zealand. (Daylight savings not taken into account.)
What is the time difference between London and Sri Lanka?
Specifically, it is 4 1/2 hours ahead of British Summer Time. It is 5 1/2 hours ahead of Greenwich Mean Time.
Where does Britain and London get there time from?
GMT (Greenwich Mean Time). 0 degrees Longitude runs through Greenwich, a suburb of southeast London.
What is the time difference between Moscow and Tanzania?
Moscow is (Greenwich Mean Time) GMT +3 hours, ie. 3 hours ahead of Greenwich, England. Tanzania is (Greenwich Mean Time) GMT +3 hours, ie. 3 hours ahead of Greenwich, England. There is no time difference. (Daylight savings not taken into account.)
