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GPS

The faster you travel, the slower time passes. So goes Einstein's theory but, what has this to do with the Global Positioning System or GPS.

GPS uses a network of satellites orbitting the Earth at speeds of 14,000 kilometres per hour to accurately pinpoint locations all over the globe.

A Global Positioning Satellite

To ensure precision its vital the time kept by the satellites is the same as the time kept by the receivers on the ground.

But, the satellites travel so fast that compared to the receivers on Earth, time runs slower by 7 microseconds a day. If we didn't use Einstein's theories and take thisinto account. The accuracy of GPS Systems would drift by more than 2 kilometres a day.

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