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K Gravity
Gravitational System Simulator
The earliest precursor of the KGravity windows program that performed N-body gravity calculations was named Greg's Galaxy. I started one Spring several years ago and by that August the basic Gravity Poll calculations were accurate enough to keep the Earth, Moon and a couple of planets in orbits about the Sun for centuries of KGravity time. That's one day per cycle for a planetary system. KGravity has been one of several programs employing the Win32 API that claimed time in the past 14 years.