Noninvariant one-way speed of light and locally equivalent reference frames

We consider an isotropical inertial reference frame (“stationary”) and in it a uniformly rotating circular platform of radius R. The velocity of light ˜ c relative to the rim of the platform is calculated and found to have values necessarily different from c. This ˜ c remains the same if R is increased but the peripheral velocity is kept constant. Since by so doing any small piece of the circumference can be considered better and better at rest in a (“moving”) inertial system, the velocity of light relative to this system can be deduced. Noninvariant values are obtained and shown to coincide with the predictions of our recently published “inertial transformations”. Key words: special relativity, velocity of light, conventionality. 1. SPACE AND TIME ON A ROTATING PLATFORM The basic idea of the present paper is that every time one learns something new about accelerated reference frames, one learns something new also about inertial frames. In fact the latter frames can always be considered as particular cases of the former ones with zero acceleration. The limit a Æ 0 does not need to be taken litterally, mathematically. In fact no perfectly inertial frames exist in practice, e.g