Update README.txt

luke738 · Oct 13, 2016 · d89fc25 · d89fc25
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-A numerical simulation of n-body newtonian gravity in 3d.
+A numerical simulation of n-body newtonian gravity in 2d. Precursor to OrbSim2-3d, which lives in its own repo.
 Can be used to simulate actual physical systems, and also to make some interesting-looking animations of a large number of bodies interacting.
 Based off of some of the work from BallisticSim and OrbitalSim, uses 3rd order explicit Adams-Bashford method for numerical integration.
 Much faster than the earlier simulators.