What are the main algorithms for calculating satellite orbits

[Huancang]

What are the main algorithms for calculating satellite orbits？I'm more concerned about that you don`t use the trueanomaly .
If you can give me an answer, it will be very grateful。

[FlorentF9]

It has been a long time since I've written this software. The orbit computation is done in the Orbit.cpp file. It uses the mean and eccentric anomaly (I remember I used formulae that we derived in class in engineering school) - you suggest that the true anomaly should be used instead? I will not have time now to update the sofware, but feel free to propose a pull request!