I have to propagate the orbit of a satellite in 1 year, complying with the Sun, Moon and zonal harmonics effects.
Is there preferably a free software, which could be used? I was suggested to use PyEphem. Does it really give accurate results, considering Moon, Sun, zonal harmonics, and probably- Jupiter and Venus?
What I really need, is to calculate the change in argument of perigee of the orbit in 1 year.