1. Celestial Dynamics The branch of astronomy that deals with the motion of celestial objects.

2. Celestial Mechanics is about calculating astronomical objects and planets and predicting their future position. Much of the celestial mechanics are automated nowadays.

3. Chaos Many problems in Celestial Mechanics are characterized by evolution due only to gravitational forces. It is no longer possible to talk about celestial mechanics without mentioning chaos. Chaos in this case means- that these three regime are not strictly separated. Regime of motion of meteor

4. Celestial Mechanics is over 4 centuries old. It can not be restricted to gravitational forces, there are many non-gravitational forces acting on the celestial bodies the perturb the motion in a significant way.

5. Celestial Bodies The massive objects that define our universe such as stars, planets and comets.