If we read the article:
https://www.researchgate.net/publication/261700742_Classical_and_Relativistic_Derivation_of_the_Sagnac_Effect
Shouldn't we consider the traditionnal addition of velocities ?
If yes, how does it come that c is constant ?
Thank you for your answers.
Note: I don't believe in Ether, but how can we match the absence of special/general relativity with a constant speed of light ?
Article Classical and Relativistic Derivation of the Sagnac Effect