in 1959, and later refined by Gravity Probe A and other experiments.

Gravitational time dilation is closely related to gravitational redshift, in which the closer a body emitting light of constant frequency is to a gravitating body, the more its time is slowed by gravitational time dilation, and the lower (more "redshifted") the frequency of the emitted light would seem, as measured by a fixed observer.

Definition

Clocks

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