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The prime meridian is the 'vertical equator', or the line that marks the poitn of the Earth where the longitude is to be at 0 degrees. On either side of the prime meridian are the West and East hemisoheres.
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The prime meridian is the 'vertical equator', or the line that marks the poitn of the Earth where the longitude is to be at 0 degrees. On either side of the prime meridian are the West and East hemisoheres.