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- Does the Michelson-Morley experiment have errors in the equations? And can it prove the variable speed of light?

I would like to know the opinions on the paper that I saw about Michelson-Morley experiment.

Michelson-Morley experiment was done in 1887 and had an impact on the future direction of physics. It is taught in schools as an experiment that proves the non-existence of the aether and proves the constant speed of light propagation.

I recently found this paper:

https://www.researchgate.net/publication/262925968_Michelson-Morley_experiment_proves_light_speed_is_not_constant

They showed that MM made errors in calculations in original paper and even claims that results of experiment confirms variability of speed of light.

I think the calculations they made are precise. Most of them are actually equations from the Pythagorean theorem. If the experiment was so inaccurate. Why no one noticed it much sooner?

Michelson-Morley experiment was done in 1887 and had an impact on the future direction of physics. It is taught in schools as an experiment that proves the non-existence of the aether and proves the constant speed of light propagation.

I recently found this paper:

https://www.researchgate.net/publication/262925968_Michelson-Morley_experiment_proves_light_speed_is_not_constant

They showed that MM made errors in calculations in original paper and even claims that results of experiment confirms variability of speed of light.

I think the calculations they made are precise. Most of them are actually equations from the Pythagorean theorem. If the experiment was so inaccurate. Why no one noticed it much sooner?