The subjects continually evolve and change every year based on discoveries Astronomy is one of the oldest sciences, practised by most of the world's ancient.
At the University of Arizona it is required for an undergraduate to pass Calculus Of course you do not need a college degree in Astrophysics or Astronomy to look at the stars. Usually AT LEAST enough math for a minor in math, if not more.
That's four years of 2 classes per semester, calculus based physics. Most astrophysics types are expected to know one major compiled language . Liberal Art College: these are small, have fabulous teachers (on average.