| 1. | But one of them which is already working is the atomic clock.
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| 2. | Modern estimates are made with a laser beam and an atomic clock.
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| 3. | In atomic clocks, oscillations of laser light serve as the pendulum swings.
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| 4. | Since then, caesium has been widely used in highly accurate atomic clocks.
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| 5. | The satellites transmit signals on a schedule precisely controlled by atomic clocks.
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| 6. | Gravitational time dilation has been experimentally measured using atomic clocks on airplanes.
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| 7. | But this has nothing to do with the accuracy of atomic clocks.
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| 8. | ET was used for the calibration of atomic clocks in the 1950s.
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| 9. | The pattern's frequency sweep is timed by an atomic clock . ]]
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| 10. | Japan Standard Time is set by a caesium atomic clock in Tokyo.
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