Hi, Thanks for playing L.O.T.H.! If your talking about predicting real satellites there is a lot more that goes into it but in general I would start with the 'Two Body Problem.' I can't explain much of it here of course but I can point you in the right direction. Let me know if you have specific questions and maybe we can take it to discord. I don;t know of a plugin that does the same stuff but I have considered making one. *This 'simple' orbital mechanics problem quickly becomes a 'floating origin' problem once you get deep in. I love this stuff but it doesn't seem to have a bottom.... down the gravity rabbit hole.
And multiplayer... is the main goal..