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[ Longitude : The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time ] You may have seen the A and E presentation of the movie Longitude. The book that inspired this fine movie is Longitude : The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time by Dava Sobel.

Before the American Revolution John Harrison sought to solve the riddle of accurately finding one's location at sea. His course takes some interesting twists and turns.

Of course you can order the book from Amazon.com by clicking on the image

During the occurances of daylight / standard time changes it is probably best to do conversions by hand. These changes happen once in the fall and once in the spring.

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