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I’m really interested in understanding this. So please indulge me... So, I’m Oumuamua rocking my way through interstellar space. I see nothing around me so as far as I know I’m not spinning. Then, all of a sudden I happen upon a solar system that is spinning around me. Who is spinning? Me or the solar system?

Is the point here that I’m spinning with reference to my direction of motion?

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Yes. You are aware that you are spinning even without external reference because your outer parts are accelerating toward your inner parts. This is the feeling of spinning in a circle on earth too.

This is how plausible simulated gravity works too. A ship spins. It doesn’t require a reference to know whether it’s spinning.

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