How is Greenwich standard time is decided
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Greenwich Mean Time (GMT) is the time measured on the Earth's zero degree line of longitude, or meridian. This runs from the North Pole to the South Pole, passing through the Old Royal Observatory in the London suburb of Greenwich.
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The Greenwich meridian marks the starting point of every time zone of map
Every 15°longitude represents one hour's difference in time (24*15) =360
You can work out time at every location on earth if you know how many degrees it west or east
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