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Greenwich outside London, Britain.

prime meridian

Greenwich Meridian

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Clarification. Each of the world's basic time zones is 15 degrees of latitude wide. It should be obvious that 15 degrees times 24 equals 360 degrees, accounting for the entire globe. The system of latitude and longitude was established in Greenwich with Greenwich at zero degrees longitude, but the time zones were defined in such a way that Greenwich is in the middle of its zone. That time zone extends for 7.5 degrees to the east and to the west of the Greenwich meridian, defining its full 15 degrees.

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Janet Torp

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3y ago

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