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In studying SR, I've been subscribing to a particular definition of a Frame of Reference that makes sense to me. Recently, I've been made aware by another PF member that there may be other, broader, definitions that are valid and that people use. I would like to know more about these broader definitions, and, if possible, what fraction of the PF population uses them. My PF friend's comments have even led me to question the validity of my own definition. So here goes: According to my understanding, a FoR is a collection of physical objects (and possibly 3D spatial coordinate systems) which are all at rest relative to one another. So far, this is the only definition that has worked for me.
Chet
Chet