1 jan 1995 ano - google earth/ today's tech/ GPS
Descrição:
The Global Positioning System (GPS) is a network of about 30 satellites orbiting the Earth at an altitude of 20,000 km. Once it has information on how far away at least three satellites are, your GPS receiver can pinpoint your location using a process called trilateration.
Adicionado na linha do tempo:
hilbert project
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