"Emission theory, also called emitter theory or ballistic theory of light, was a competing theory for the special theory of relativity, explaining the results of the Michelson–Morley experiment of 1887. [...] The name most often associated with emission theory is Isaac Newton. In his corpuscular theory Newton visualized light "corpuscles" being thrown off from hot bodies at a nominal speed of c with respect to the emitting object, and obeying the usual laws of Newtonian mechanics, and we then expect light to be moving towards us with a speed that is offset by the speed of the distant emitter (c ± v)." https://en.wikipedia.org/wiki/Emission_theory

So, in 1887, the Michelson-Morley experiment was compatible with Newton's variable speed of light, c'=c±v. Was the experiment simultaneously (that is, in 1887) compatible with the constant (independent of the motion of the emitter) speed of light, c'=c? In Einstein's schizophrenic world the answer is "yes".

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