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BIG KUDOS to Martin Gruesenick!!!
The instrument is an interferometer which splits a light beam into two. Then each beam travels the same distance but in different routes.
If space is not measurable (nothing between molecules) and space is not moving, then figure one is true. Light is traveling through empty space or space is perfectly motionless or light is not affected by the motion of space. Since the light beams are traveling the same distance, the two light beams will arrive at the same time and the interference pattern will be steady regardless of the direction of rotation.
If space is measurable (something between molecules) and is moving inside Earth's atmosphere and can drag light with it, then figure two is true.
Here is a list of other videos and pages that support that space is measurable and it is in motion.
Explanation of the Sagnac effect (Doppler effect) using relativistic explanations, such as length-contraction, time dilation and the "observer" concept.
My comments about this paper: First of all, I am in no way saying that the Earth is the center of the universe and everything in the cosmos is orbiting the Earth. Second, I am in no way saying that relativistic theories are valid explanations for the observable real-life or experimental results. Just the opposite. I am very sorry to contradict legendary figures such as Einstein and Lorentz. But if we can explain the same results with simple Newtonian equations.
Here is an experiment that appears to debunk the experiment conducted by Martin Gruesenick.
My comments about this video. I do see a small shift to the left in the fringes when going in one direction and a small shift to the right when going in the opposite direction. The device used in this video is practically centered on the rotating arm, definitely NOT repeating the same conditions of the Martin Grusenick experiment.
I am not the first one to propose that space (without matter) is not empty. The concept was known as the "Aether". Today might be called "quantum foam". Many scientists in their time worked to measure and prove its existence. It was thought to be, as Einstein described it, a fabric-like structure. But that was mathematically and experimentally shown as incorrect. Modern science completely abandoned the concept of the Aether. Now the vacuum is becoming increasingly a focus of researchers and theorists. Why? Because there are things that are not easily explainable with current knowledge. Particularly difficult are gravity, intertia, mass, and wave-particle duality. ST bubbles framework presents a plausible explanation to all those mysteries.
Here is one way to prove that space, that is the area between molecules and particles, is not empty.