Sundial gnomon und GPS (satellite navigation): was sie gemeinsam haben

1. Schritt 1. Sundial gnomon — ist Teil von — Sundial. A rod that casts a shadow.
2. Schritt 2. Sundial — funktioniert wie — Water clock (clepsydra). Two ancient ways to measure time: by a shadow and by flowing water.
3. Schritt 3. Water clock (clepsydra) — entwickelte sich zu — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.
4. Schritt 4. Mechanical clock — entwickelte sich zu — Quartz clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
5. Schritt 5. Quartz clock — entwickelte sich zu — Atomuhr. The quartz oscillator is tuned to an atomic standard.
6. Schritt 6. Atomuhr — wird verwendet in — GPS (satellite navigation). The satellites carry atomic clocks; the position is calculated from signal arrival times.

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