The most desired Reference Frame and most largest Reference Frame that spans Space-and-Time is the Vacuum of Space itself (bereft matter, including light).
This Space could be following a Gyroscopic Spin, where any three Orthogonal Axes are always "spinning" each other.
So if we split light in 2D, or 3D version of MM experiment, and one dimension is moving in favor and then against light, and the second dimension is moving along "hypotenuses" is meaningless.
The space between them is always slipping and gyroscopic. So the light travels the same distances in all directions. They could prove this with 3D version of MM Experiment.
I am aware that the MM experiment has been carried out at various places on the Earth, in both the North and South hemispheres, at various times of the year, and thus with the axes of the interferometer at a range of inclinations to the galactic plane. Does this address uour question?
The assume AEther to be a one-dimensional drift like an air. AEther is much more complex like Neutrinos.
Then MM Experiment does not think in terms of Photon Entanglement.
MMX was aimed at detecting v/c in the order of 10-8 and dependent of gravity and vibrations. So, footsteps could be detected at a range of about 100 m. Therefore, the method is limited to the horizontal plane.
What it has to do with foot-steps and gravity in MM experiment?
We are ruling out a possible spinning in all axes much faster than the speed of the earth and even the entanglement.
The extreme sensitivity forced Michelson to use an equipment floating in Hg.
However, instead of v/c squared we can use first order effects, and this effect can be detected in 3 dimensions.
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