It gets complicates things when you have two opposing Poynting Vectors. "c" is also a rotational force in electricity, and may very well be electricity speed.This is called question begging and appeal to authority, both of which are fallacies.
We have measured the TWO-WAY speed of light, and "c" is how we've defined the result.
What we're trying to determine however, which has NOT been measured, EVER, is the ONE-WAY speed of light, from a source to the first object that the light encounters.
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