GalaxSee was validated by using it to predict the orbital period of an Earth-mass planet orbiting a Sol-mass start at 1 AU.
Any valid gravitational simulation tool should be able to simulate the movement of the Earth about the Sun. Through trial and error the value of the tangential velocity that would create a stable rotation was found to be approximately 0.172 AU/day, resulting in an orbit of approximately 1 year. The observed value is .01719 AU/day (2 pi AU per year). In addition when the accepted value is filled in the proper field, the orbit is stable and repetitive.
Other validation tests are discussed in the extended example.