Body: "Theoretical astronomy and celestial mechanics" is the field of analytical models, physics and chemistry, astronomical objects.
Some reasons we look at "Theoretical astronomy and celestial mechanics" include learn and know the challenges and happenings of the area.
Johannes Kepler, Simon Newcomb, Jeremy Heyl are a few specialists of "Theoretical astronomy and celestial mechanics".
Some subfields in "Theoretical astronomy and celestial mechanics" include Integrating astronomy and chemistry, objects in outer space, Perturbation theory.