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GPS satellites orbit about 20,000 km above Earth, where gravity is weaker.
According to Einstein’s General Relativity, weaker gravity makes time tick slightly faster — around 45 microseconds per day faster than clocks on Earth. If this effect weren’t corrected, GPS positions would drift by about 10 km every day! So, every time your phone gives you directions, it’s thanks to Einstein keeping your satnav on track.

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