Throughout the nineteenth century scientists believed that a supermundane gas was pervading the whole Universe. Magnetism and electricity were analyzed as stresses, strains and flows in a fluid medium. Light was thought of as compression waves propagated in Aether, analogous to sound in air. It followed from this analogy that the speed of light should be measured relative to the Aether. Newton assumed that the Earth orbits around the Sun, while Maxwell assumed that the all-pervading Aether is motionless. Based on the foregoing, scientists predicted that the Earth must move relative to the Aether. Therefore, the speed of light measured on Earth should give different results when measured in different directions.
Nevertheless, the famous Michelson-Morley experiments produced a definite 'Null-result' for all such measurements. Seemingly, Classical Physics could not resolve this dilemma: Either Newtonian astronomy is wrong and the Earth is not moving, or the motionless Aether of electromagnetism is erroneous.
Einstein declared that this dilemma cannot be solved by common sense or classical logic. Thus, he postulated the constancy of the speed of light and the non-existence of the all-pervading Aether. The mathematical tool of relativity, the Lorentz Transformation, circumvents the problem by a method of adjusting for the differences between classical predictions and the Michelson-Morley Null-result.
Aethro-Kinematics uncovers the fundamental misconception that the Earth moves relative to the Aether and reinstates Descartes' original theory that the Earth and the planets are carried within the gigantic Aether-vortex of the Sun.
Since there is no relative motion between the Earth and Aether, the Michelson-Morley experiments cannot show anything but 'Null-results'. The measured speed of light on Earth must be the same in all directions. -- Thus, the relativistic postulates and their mathematical machinery is superfluous and wrong.