Atomic Clock

Those effects of relativity are critical for the operation of the GPS, a network of 24 satellites orbiting the earth at nearly 9,000 mph.

Each satellite carries an atomic clock capable of billionth-of-a-second accuracy..

Source: http://www.tennessean.com/article/20100314/OPINION03/3140350/1008/OPINION01/How+Albert+Einstein+is+helping+keep+you+from+getting+lost

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