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The zero line of longitude is a matter of convention; it was established by the British Royal Navy as a convenient measuring point from the Royal Observatory in Greenwich, England (a suburb of London). Locations to the east of Greenwich are in the "east longitude", while locations to the west were in "west longitude".

On the other side of the world, in the Pacific Ocean, you can sail from 179 degrees 59 minutes west to 179 degrees 59 minutes east in about 5 minutes. At the 180 degree line, "east meets west".

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12y ago

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