Planetary Astronomy is offered in the fall semester at Cranbrook Kingswood. If you are a visitor to my site,
welcome. Feel free to look around. I hope you find these pages to be useful. If you are taking a course in
Astronomy, you will find hundreds of useful links for your studies.
Let us consider the reaction to Copernicus’ book, De Revolutionibus. We have seen how Galileo became a proponent of the
heliocentric theory.
Contemporary to Galileo was Tycho Brahe, the brilliant observationalist. And finally, as we look at the slow conversion to a sun-
centered system, we should look at the three laws of orbital motion developed by Johaness Kepler.
