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There is only one Prime Meridian. It's an imaginary line on the surface of the earth that runs between the North and South Poles, and passes through the Royal Observatory in Greenwich, England. It's the official "Zero" line for east-west measurements; the 'longitude' of every place on earth is expressed as degrees "east or west of Greenwich". The USA ... not counting Alaska or Hawaii ... lies between roughly 67 degrees (Maine) to 124 degrees (California) west of the Prime Meridian.

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16y ago

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