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Why is speed of light constant in every non inertial frame of reference? Is there any theoretical explanation behind this postulate Since we cannot completely depend upon the experimental results?

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possible duplicate of physics.stackexchange.com/q/33816/11062 –  Waffle's Crazy Peanut Mar 27 '13 at 16:16
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Just to comment on your last sentence: yes we can completely depend upon experimental results and indeed we must. Only nature itself is always right and any theory must agree with experiments. This little remark aside, it is a good question. –  Wouter Mar 27 '13 at 16:26
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@Wouter why is it a compulsion to believe upon the experimental results ? There might have been error while doing experiments or next day we can prove it wrong.. I think it is appreciable if there is a postulate which is valid both experimentally and theoretically. –  newera Mar 28 '13 at 13:31
    
@kiranadhikari There is no other truth than that. Nature is what it is, it cannot be wrong. Theory can. Of course experiments can be completely erroneous, but we don't just depend on any old experiment. We only trust results that are replicable and we only trust them within the boundaries of the measurement errors. Naturally, it's one thing to get the data, it's another to interpret it. And the interpretation of experimental results can be wrong, even though the data is completely solid. –  Wouter Mar 28 '13 at 16:06
    
The last sentence of your comment above almost makes it look like you think I'm saying the two are mutually exclusive. Of course they are not and indeed there are plenty of postulates out there which agree with experiment (though often only within a certain field). But you must always remember that a postulate can only be physically acceptable if it does not contradict experimental data. –  Wouter Mar 28 '13 at 16:12
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