On local and global measurements of the speed of light on rotating platforms

The paper shows that, conceptually and operationally, the speed of light me asured locally in the inertial comoving frame of a point on the rim of a ro tating disk is different from the one measured globally for a round trip al ong the rim, obtained dividing the length of the rim (as measured in the "r elative space" of the disk) by the time of flight of the light beam (as mea sured by a clock at rest on the disk). As a consequence, contrary to some r ecent claims, the anisotropy found in the global value, obtained by the abo ve procedure, in no way conflicts with the local isotropy, and the internal consistency of the special relativity theory remains unchallenged.