Why the Michelson-Morley Experiments Give Null Result

Many researchers and physicists, including renowned scientists, have long questioned the foundations of relativity theory, which are the two postulates: the principle of relativity and the constancy of the speed of light, and their consequences. However, what exactly is wrong with relativity theory has eluded researchers for more than a century. This paper reveals the mystery of why the Michelson-Morley experiments always give null fringe shifts, contrary to other experimental evidences of absolute motion, such as the Silvertooth experiment and the Marinov experiment. A new theory/model of the speed of light is formulated as follows. The effect of absolute motion of the Michelson-Morley device is just to cause an apparent change in the time of emission of light from the source. Thus, both the longitudinal and transverse light beams are delayed or advanced equally, by the same amount, in which case no fringe shift will occur. The center of the light wave fronts is always the same point relative to the observer/detector between the moments of light emission and light detection. The center of the light wave fronts is fixed at the point where the source was relative to the detector at the moment of emission and is always fixed in the reference frame of the detector  (relative to the detector) and is therefore always co-moving with the observer/detector. The speed of light is constant c relative to the center of the light wave fronts, and therefore it is always constant relative to the observer. The mystery behind the Michelson-Morley experiment is that it is impossible to detect absolute motion from the interference pattern formed by light beams originating from a single source! Therefore, the key to detect absolute motion by using the Michelson-Morley kind experiments would be by interference of light beams from two independent sources. Such hypothetical experiment would give thousands of fringe shifts. However, such experiment is not possible with current technology, because the coherence time/length of light is very short, and because it is nearly impossible to tune the frequencies of two independent laser sources to be equal to within, say, 0.1 to 1 Hz  to get any fringe patterns stable enough to see if a fringe shift occurs with change in orientation of the modified MM device in space.