little model of solar system based on pygame

solar system emulation period_number: end of the simulation by simulation time is defined for slowest simulated object's period iteration_per_rotation: how many calculation is performed for the slowest object screen_update_period: which defines that the screen is only updated after this amount of iterations fix_center: defines if the center object should move (1: no move, 0: not fixed) simulation_target defined defines which objects shall be used for the simulation