AE2104-11. In the lecture Ir. R. Noomen kicks off the subject of orbital mechanics. He starts off with a brief introduction on the space environment, and follows with deriving some equations to describe Kepler orbits. Next the earth gravity field is described in detail. With this explain, more practical applications of orbits are covered, focusing on the ground tracks of satellites in certain orbits. Next Sun Synchronous orbits are covered, followed by geostationary orbits.