On the Conventionality of Simultaneity and the Huygens-Fresnel-Miller   Model of Wave Propagation
  We identify a fundamental space-time invariance principle by combining the thesis of the conventionality of simultaneity with the Hugyens-Fresnel-Miller model of wave propagation. By following the standard gauge prescription, we show that the classical electromagnetic potentials influence the one-way speed of light. 
Robert D. Bock
physics.gen-ph