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I want to add my personal understanding of the concept of reference frame. In the articles: Marmo, G., Preziosi, B. (2006). The Structure Of Space-Time: Relativity Groups. International Journal of Geometric Methods in Modern Physics, 03(03), 591-603. Marmo, G., Preziosi, B. (2005) Objective existence and relativity groups. Symmetries in Science XI, ...


Any frame of references where there are fictitious forces in play is not an inertial frame. and i don't understand by what you mean "...is it a separate entity?" and no, the earth+moon frame cannot be considered an inertial frame because they are moving about the sun. Can you please rephrase your question?

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