The Global positioning system (GPS) is a navigation system using 24 Earth-orbiting artificial satellites. Satellite navigation, like celestial navigation, works on the principle that if the navigator knows the exact location of a celestial body and can measure a relationship between the craft and the body, the navigator can calculate the craft’s position. In celestial navigation, this relationship takes the form of a celestial body’s altitude above the horizon.
Thursday, April 16, 2009
The Global Positioning System (GPS)
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