As per SI unit of time, it's frequency that represents time. (The unit of time is defined by taking the fixed numerical value of the cesium frequency to be 9192631770 Hz.)
Atomic clocks are automatically synchronized to a radio signal that is continuously broadcast by the National Institute of Standards and Technology in the United States.
Atomic clocks are also subject to various external influences, including gravity.
Atomic clocks are used onboard GPS satellites orbiting the Earth, but must send updates twice daily to correct the clock's natural drift.
However, although the method is a simple correction of clock frequency depending on distance from Earth and other factors, the method is still inappropriate, as it is based on time distortion when it should be wavelength distortion.
It is the phase shift in the frequency due to the infinitisimal loss of wave energy under the relativistic effect on the clock mechanism, and other distortions.
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