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POPSWhat is a nautical mile, and how does it differ from a normal mile and a kilometer? This article also explains the traditional measurement of a kilometer: "A kilometer is also defined using the planet Earth as a standard of distance. If you were to take the Earth and cut it in half along a line passing from the North Pole through Paris, and then measure the distance of the curve running from the North Pole to the equator on that circle, and then divide that distance by 10,000, you would have the traditional unit for the kilometer as defined in 1791 by the French Academy of Sciences." A few further reference http://en.wikipedia.org/wiki/Furlong http://en.wikipedia.org/wiki/Mile
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