Smartphones can find your location by communicating with GPS satellites., GPS satellites orbit thousands of miles above Earth., They constantly send radio signals to your phone., Your phone measures how long the signals take to arrive., It uses this time to calculate the distance to each satellite., Atomic clocks are used because radio signals travel extremely fast., Cesium-133 atoms provide an extremely precise frequency for these clocks., The signals from several satellites create overlapping spheres around their positions., By comparing these distances, your phone can determine where you are., Einstein's theory of relativity helps make GPS calculations even more accurate.

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