this post was submitted on 23 Sep 2024
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So i guess what your asking is what is the stationary point of reference that you use to calculate your position? You can use any object but typically you use whatever object your gravitationally bound to. Like in earth orbit you use earth, in interplanetary space you use the sun, in interstellar space it becomes more up to you. Center of galaxy maybe, or nearest star. Kinda depends what ur trying to do.