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sticklebat t1_irk9qql wrote

Reply to comment by GolfSierraMike in Quantum philosophy: 4 ways physics will challenge your reality by ADefiniteDescription

That’s not a “fact.” The speed of light is frame invariant, so it’s one of the few things that’s not relative in the first place.

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GolfSierraMike t1_irka16s wrote

Sorry, I've always understood that since it's impossible to know the speed of light in one direction we can't know the actual speed of light.

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sticklebat t1_irkdh7w wrote

Oh, that’s what you meant. It’s true that we can’t measure the one-way speed of light, but we do know that the two-way speed is 300 million m/s and isotropic, and that is always what is meant by “the speed of light” unless explicitly stated otherwise. If this is actually what the person was referring to, then they were being absurdly obtuse.

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