Abstract
One of the postulates of the Special Theory of Relativity is that the speed of light is constant in all inertial reference frames regardless of the motion of the observer or source. This postulate also apply to the General Theory of Relativity.There are many experiments whose results are consistent with the assumption that gravity does not affect the speed of light. But notwithstanding all this we may argue that it has not been formally proved. One way to prove its correctness is to replace it with the opposite axiom, axiom of variable speed of light. If there is at least one experiment whose result would possibly be in contradiction with this axiom, then it must be rejected and the axiom of a constant speed of light must be accepted.
Highlights
We measure time with a clock, but we cannot say that time is what is measured by a clock
It has been demonstrated that atomic clocks at different altitudes will eventually show different times
This happens because ”real” times at different altitudes are different. Another possibility is that the accuracy of the clock is affected by external factors, such as gravity
Summary
We measure time with a clock, but we cannot say that time is what is measured by a clock. The closer the clock is to the source of gravitation, the slower time passes, speeding up as the clock getting away from the source of gravitation [1]. This happens because ”real” times at different altitudes are different. Another possibility is that the accuracy of the clock is affected by external factors, such as gravity. External factors affect the object we are measuring and the accuracy of the instrument we use in the measurement
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