Fuertes Observatory at Cornell. Note that the start time in winter is 8 pm, not 9 pm as stated on the home page.
Astronomical Applications website at the U.S. Naval Observatory.
Views of the Solar System, by Calvin Hamilton.
The Worlds in the Solar System - some quick to-scale comparisons.
Mastering Astronomy - the website of the textbook publisher
Last modified 11 January, 2012.