Some considerations in the Michelson-Morley Experiment!
Frank Russo - April 16, 2008.
One must of course realize that the speed of light and of the earth are independent of each other so that by changing the length that the mirror travels in the away sub-interval, one also changes the amount of light-travel per second that such a mirror motion would require despite not changing the overall sub-interval. Another major consideration is that time is only an artefact: it is relative motion that is real rather than time!
Hence one must realize that if one shortens the amount the mirror travels by 0.166598191m to 2.091124102m, the amount of light travelled during this mirror motion (per second), is also shortened; with the amount of the latter's shortening being equivalent to 4,683,415.2m giving you a sub-interval of 2.091124102 / 49,272,606.19 ... the latter being of the same duration as the overall subinterval for light, which is an independent 12.92192328/304475873.2
You can come to this conclusion by realizing that you would have to add 4,683,415.2m to the relative orbital velocity figure of 44,589,190.99m/sec because not only that's the equivalent of 304475873.2m minus the relative speed of light of 255203267m/sec but also because the 0.166598191m of the mirror's amended travel is to be expanded to 0.169200818m for considerations of "relative" versus "absolute" length.
In view of the foregoing it is evident that relative motion is a very important factor central in any time considerations!
For an updated view:
371 A different slant on the Orbital Speed involved in the Michelson-Morley orbital gap. written by Frank Russo, July 11 2008