Gravitational Time Dilation Prediction
Einstein argued that clocks deeper in a gravitational field should run more slowly than clocks at higher gravitational potential, giving gravity a measurable effect on elapsed time.
Albert Einstein · Event
Einstein argued that clocks deeper in a gravitational field should run more slowly than clocks at higher gravitational potential, giving gravity a measurable effect on elapsed time.

Einstein argued that clocks deeper in a gravitational field should run more slowly than clocks at higher gravitational potential, giving gravity a measurable effect on elapsed time.