[Agemegos]

My understanding is that astrophysics is concerned with the nature of the heavenly bodies in distinction from their positions and motions. Then I was at university the course "Astrophysics" dealt with the physical processes inside stars, novas, supernovas etc. and their development from formation to their final fate as white dwarfs, neutron stars, black holes, planetary nebulas, etc.; "Lagrangean Mechanics" dealt with orbital motions (and was taught by the School of Mathematics); and Cosmology dealt with the history and large-scale nature of the cosmos as a whole. Planetology wasn't taught there (ANU) at that time (the late Eighties), but it is taught as a separate undergraduate topic nowadays (I have an undergrad textbook from 1994).

There is still important astronomy being done in simply finding out what things are out there and where exactly they are. E.g. exoplanet searches and distance determinations.