The zero-degree parallel of latitude is fixed by the laws of nature, while the zero-degree meridian of longitude shifts like the sands of time. This difference makes finding latitude child's play, and turns the determination of longitude, especially at sea, into an adult dilemma-one that stumped the wisest minds of the world for the better part of human history.
( Dava Sobel )
[ Longitude: The True Story of a ]
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