How do we know how fast light is?
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Another reason we know what speed c is has nothing to do with light; light simply happens to be able to travel at the speed limit. c stands for causality, it’s the speed at which things can be acted upon from an outside perspective. That speed has been calculated and theorized, and we measured whether light travels at that speed as predicted of our models.
From the light point of view, travel is instantaneous due to time being warped as you go faster. From the point of view of others, it goes at speed c, effecting empty space and anything it goes through or gets reflected/refracted on to travel on.
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