@nooneinparticular Said
Correct. There were however two varying conditions in which they could compare their data with. The light moving along the aether and the light moving against the aether. If the aether existed and is moving in some direction, then if you test every direction, you should see a change somewhere.
Are you attempting to argue that an interferometer does not and cannot cause light beams to go out of phase from each other? So then what does it do to create an image of varying light intensities?
But there is no aether, or thats the assumption now. So there would not be any reason to see a difference then. You would be demonstrating nothing interesting with this setup. (unless there was an aether, AND it affected light, two big assumptions.)
The interferometer shows something, but what? why?. its not proven whats going on, just more assumptions. Physicists will tell you that they don't really know much about light. Just lots of assumptions as to whats happening.
Anyway, because of the return on the same path over the same distance, the design of the interferometer is NOT showing what they thought it was supposed to be showing, that is, that something would cause the light to change speed, when aligned in a particular way, but not at 90 degrees.
The LIGO interferometer detecting "gravitational waves" is a joke, surely.
You have to explain how the net time elapsed for swimming "with" and then "against" a current, compared to swimming with no current at all, could be any different.
Given the same distances in both tests.