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Re:Orbital Mechanics – How do rockets get to where they're h... by aw1621107 on Tuesday April 27, 2021 @06:31PM (#26962735)
There's always Principia for your n-body needs [0].

[0]: https://github.com/mockingbirdnest/Principia

Re:Orbital Mechanics – How do rockets get to where they're h... by ericbarrett on Tuesday April 27, 2021 @08:05PM (#26963765)
Seconded. Principia is amazing; first thing I did after installing it was set up a Kerbin-Mun L4 orbit.

Another thing I found, due to the full n-body integration Principia adds, is that I was able to correctly guess which side of Kerbin the Mun was on due to tiny perturbations in my craft's equatorial orbit.

Re:Orbital Mechanics – How do rockets get to where they're h... by mumblemumble on Tuesday April 27, 2021 @09:10PM (#26964179)
Knowing that this exists might be what convinces me to finally get a reasonably up to date computer.