Explaining Sagnac Experiment: Einstein & Constant Velocity of Light

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The discussion centers on the Sagnac experiment and its implications for Einstein's postulate of the constant velocity of light. Participants express frustration over the lack of clear explanations available online regarding this phenomenon. The Sagnac effect is highlighted as a point of contention between proponents of relativity and advocates of aether theories. A specific discussion titled "Reflections on Relativity/The Sagnac Effect" is noted for not dismissing relativity outright. Overall, the conversation seeks to reconcile these differing viewpoints within the framework of established physics.
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Is there anyone here that can explain this phenomena using Einsteins postulat that the velocity of light is constant?
I haven't found any explanation to the phenomena on the Internet.
 
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The Sagnac experiment appears to be a favorite case among the CON-relativity and PRO-aether folks (the two groups are not entirely overlapping). The following is the best discussion of it I found that doesn't conclude with relativity-is-wrong. I don't know who wrote it.

reflections on relativity/the sagnac effect, by mr./ms. ?
 
So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
I am attempting to use a Raman TruScan with a 785 nm laser to read a material for identification purposes. The material causes too much fluorescence and doesn’t not produce a good signal. However another lab is able to produce a good signal consistently using the same Raman model and sample material. What would be the reason for the different results between instruments?

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