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| Joined: | Sun Oct 28th, 2007 |
| Location: | East Northport, New York USA |
| Posts: | 784 |
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pick up a book called "Longitude" by Dava Sobel. Good read; quick and easy.
http://www.amazon.com/Longitude-Genius-Greatest-Scientific-Problem/dp/0140258795
Should answer your q's.
Marc
It is a really good book and as Marc says it does explain it.