Sounded more to me like just a "that's outside my area of expertise so I can't really contribute".

Also, "frame of reference" has a specific meaning in relativity but it also has a more general meaning regarding the framework within someone understands something. It's pretty clear from the context (imo) that this latter is what was meant in this comment.

Thank you, yes, that's what I meant- I dont' know physics (well, very little) so the OP's comment left me confused and I didn't realise there's a technical meaning of "frame of reference". It doesn't help that, in the case of the theory of epicycles and the location of the Earth in space, the technical and colloquial term can mean the same thing.

"I'm not that kind of geek" is a bit of an in-joke so my bad for using it where the context is missing, but I thought it would work even so. The missing context is that a colleague used to tease me for my deplorable lack of a science background, although we did hit it off in terms of our fantasy and science fiction tastes. So, I was not the science kind of geek, although I was the science fiction and fantasy kind of geek.

I don't see that there is an argument - rather that a separate chain of discussion has started. It's fair to then say "well that's all fine but what I was thinking of was X" which is what I am reading. I think that there is a big difference between frames of Einstein (I don't understand these) and frames of reason and perception (I don't understand these either) but I do see that there are two different things!

Like I don't understand either Australia or Argentina.. but I know that they are not the same!