Endless Facts, One Snippet at a Time
The Science of GPS: Relativity in Your Pocket
- GPS stands for Global Positioning System, a network of orbiting satellites.
- Each satellite constantly broadcasts signals with precise time stamps.
- A GPS receiver calculates position by comparing signal travel times.
- At least four satellites are needed to pinpoint your 3D location.
- Atomic clocks on satellites keep time accurate to billionths of a second.
- Einstein’s relativity matters: satellites tick faster due to weaker gravity.
- Without relativity corrections, GPS would drift kilometers each day.
- GPS enables navigation, mapping, farming, and even financial transactions.
- It’s accurate to within a few meters—or centimeters with advanced methods.
- GPS proves how cutting-edge physics shapes everyday life.