Epistemology regarding c

  • Level: Undergrad 
  • Thread starter tezk_4
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TL;DR
How do we know what we know
How do we know that c is the speed limit if our instrument is based on that speed limit, if the "medium" on how we perceive information is only photon then how do we calculate other "medium", isn't it's like relative velocity equation but the c is not constant but variable of the "medium" velocity, Velocity=velocity 1+velocity 2÷1+velocity 1×velocity 2÷medium velocity²