The newest measurments of COBE has detected a 380 km/s "absolute" movement of Earth (= c/800) in accordance with microwave background irradiation. If it would be any kind of effect of the aether wind on propagation of light as originally suspected by Michelson, so the quaternerly mirrored lightbeam travelling inside the 1 m long arms of the interferometer, should suffer 16 mm lateral deflection, so the light would miss the mirror at all...
The thought of Michelson-Morley experiments was fundamentally wrong as long as the red light goes against the aether wind, the blue one goes before the wind. The two effect almost compensate each other, then as much as red light goes slower, the blue light goes fasterThe speed of light c constant with respect to aether only. If the aether (what I call DVAG) streaming (eg. near a huge mass) then the measured speed of light depends on on the direction of light..
When we rotates the instrument by 90 degree, a resting small difference between running times also appears. But for the process of interference it is absolutely equal situation, whether the ray 1 goes a bit slower or by turning the interferometer the ray 2 goes as much as slower, namely the two beam are completely inverted, so any shift in interference stripes during rotation are NOT to be expected.
On the other hand if the interferometer was not rotated and let it be at rest, so daily and annual cycles can be detected, because the Earth rotational axis not coincide with the usual turning process of MM interferometer. Ergo the interferometer should turn on other axis for detection of aether wind. The turning axis should be coincide with the axis of one arm of interferometer !! In that case shifting interference lines may detectable, depending on direction of aether wind. (I think).
Last but not least DVAG "flows" NOT horizontally but vertically, in the direction of Earth mass center. That effect would be undetectable with horizontal rotation of interferometer floating on mercury surface even if device otherwise would be appropriate for that purpose.