Disproving Einstein’s light speed invariance postulate

The conceptual validity of the light speed constancy postulate has been studied both analytically and through a thought experiment. It is shown that the presumed light speed invariance principle contradicts physical reality and that the speed of light measured relative to a moving inertial frame depends on the velocity of that frame. A simple thought experiment further reveals that the measured value of the speed of light relative to a moving inertial frame depends not only on the speed v of the frame but also on its direction of motion relative to the direction of propagation of the light pulse. The speed of light acquires a value of ( c − v ) or ( c + v ), depending on whether the frame and the light pulse move in the same or opposite directions, respectively.