'Absolute time' is an illusion.
In February 1919, Frank Dyson of the Royal Greenwich Observatory and Arthur Eddington of Cambridge University arranged for two teams of astronomers to observe and photograph a solar eclipse that was to occur in May of that year as it moved across South America, the Atlantic Ocean, and Africa. One team was based in Sobral, Brazil, and the other on the small island of Principe off the West coast of Africa.
The darkness of an eclipse presented the astronomers with an opportunity to observe the stars that appear closest to the sun from Earth’s perspective, as they would otherwise be completely washed out by our star’s brightness. The teams’ mission was a success.
The simplest way to explain the theory is that an object’s mass correlates to its gravitational force. The greater the mass, the greater the gravitational force, and the greater the force, the more distortion of space occurs. The strange thing to keep in mind is that the effects of gravity are the visible result of the very distortion of the fabric of space-time.
This is why a clock running atop Mount Everest is going to measure time differently than one ticking away at sea level, for example, with the clock on the mountaintop running just slightly faster than the one at lower elevation.
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