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Greenwich Mean Time (GMT) is a time system originally referring to mean solar time at the Royal Observatory in Greenwich, London, which later became adopted as a global time standard
http://wiki.answers.com/Q/What_is_the_GMT_or_Green...
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Greenwich Mean Time. Greenwich, just outside London, England sits on Longitude 0. All sea traffic took it's timing from Greenwich. Sir Sanford Fleming, a Canadian, proposed in 1878
http://wiki.answers.com/Q/How_GMT_is_calculated
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The calculation is an hour for every 15 degrees you are away from the Greenwich meridian . You need to know your longitude , then do the calculation . Remember to do plus or minus
http://wiki.answers.com/Q/How_do_you_calculate_Gre...
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