Comments about "Gravitational time dilation" in Wikipedia

This document contains comments about the article Gravitational time dilation in Wikipedia
In the last paragraph I explain my own opinion.




The article starts with the following sentence.
Gravitational time dilation is a form of time dilation, an actual difference of elapsed time between two events as measured by observers situated at varying distances from a gravitating mass.
Newton predicted the same for pendular clocks.
This has been demonstrated by noting that atomic clocks at differing altitudes (and thus different gravitational potential) will eventually show different times.
See above for Newton.

1. Definition

2. Outside a non-rotating sphere

3. Circular orbits

4. Important features of gravitational time dilation

  • There is no violation of the constancy of the speed of light here, as any observer observing the speed of photons in their region will find the speed of those photons to be c, while the speed at which we observe light travel finite distances in the vicinity of the Sun will differ from c.
This is easy to write but very difficult to test experimental.
This sentence seems to indicate that locally the speed of light is c, but outside this range it will differ.

5. Experimental confirmation

6. See also

Following is a list with "Comments in Wikipedia" about related subjects

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Created: 3 November 2017

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