Please log onto Oncourse to Locate Material for this course.
Retrograde motion:
· http://www.lasalle.edu/~smithsc/Astronomy/retrograd.html
· http://www.astro.uiuc.edu/projects/data/Retrograde/
· http://faculty.fullerton.edu/cmcconnell/Planets.html
· http://www.clas.ufl.edu/users/rhatch/pages/03-Sci-Rev/SCI-REV-Home/resource-ref-read/chief-systems/08-0retro-0.htm