SatelliteToolbox.jl VS NBodySimulator.jl

If it's for near-earth orbits, I know the Brazilian Space Agency uses https://github.com/JuliaSpace/SatelliteToolbox.jl + DiffEq for the satellite simulations.

SatelliteToolbox.jl[0] (one of the packages developed by the post author) is one of my most-used Julia packages! It's great for (among many other things) working with TLE orbits and presents a really nice interface for converting between all the different Earth-fixed and Earth-centered-inertial frames, which is generally a huge hassle. Ronan has also been very friendly to PRs on Github which is always nice. Awesome to see this mission come together!

[0] - https://github.com/JuliaSpace/SatelliteToolbox.jl

Ah, like the N-body problem? That certainly sounds doable, but not super in my wheelhouse. Plenty of differential equation packages, and I know there are some cool animation/visual packages. I've even seen some that are interactive, so you could possibly on a plot see what changing the parameters does in-time. Neat stuff. Have fun! Maybe start by recreating the 2- or 3-body problem, as I'm sure that's been done and probably can be found with some searching. (I just saw this too, may be relevant https://github.com/SciML/NBodySimulator.jl ) Julia is a joy to use, in my opinion.