This applet numerically integrates the exact Newtonian form of the equations of motion
for test particles in Newtonian orbits (red), Schwarzschild (green), and Gullstrand-Painleve (blue)
orbiting around a black hole. For an explanation of the equations of motion, see
The Force of Gravity in Schwarzschild
and Gullstrand-Painleve Coordinates, Carl Brannen, (2009, 6 pages LaTeX).

Source code: GravSim.java

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