Luboš Motl repeats my argument against Julian Barbour:
http://motls.blogspot.fr/2016/01/space-dynamics-and-antirelativistic.html
"The first problem with Mercati's "replacement" is that the "relativity of simultaneity" isn't a postulate or axiom of relativity. It is an unavoidable derived consequence of the postulates. One may be interested in this question or not interested in this question (whether the simultaneity is absolute or relative). One may emphasize or suppress this question. But the point is that we may talk about it and once we do, relativity gives an unequivocal answer: different observers must differ in their notion of simultaneity of two events. Otherwise the equivalence of the observers (principle of relativity) must be violated; or (like in Newton's theory) the speed of light will depend on the motion of sources and/or observers."
Correct. And the speed of light does depend on the motion of sources and observers.
Pentcho Valev