De que é feito GPS (satellite navigation)
Finding a position from satellite signals.
- Artificial satellite — tem como parte. A constellation of satellites.
- Relógio atômico — utiliza. The satellites carry atomic clocks; the position is calculated from signal arrival times.
- Ondas eletromagnéticas — utiliza. Radio signals.
- Theory of relativity — utiliza. Corrections for the relativistic slowing of clocks.
- Silicon — é feito de. The receivers are silicon.