Seasons http://www.classzone.com/books/earth_science/terc/content/visualizations/es0408/es0408page01.cfm?chapter_no=04
Equinox and Solstice http://stellafane.org/misc/equinox.html
Moon Phases 1 http://www.briancasey.org/artifacts/astro/moon.cgi
Moon Phases 2 http://www.ncsu.edu/project/agronauts/print_mission1_moonquiz.htm
Solar Eclipse http://www.mreclipse.com/Special/SEprimer.html
Lunar Eclipse http://eclipse.gsfc.nasa.gov/lunar.html
Astronomy Sites http://apps.exploratorium.edu/10cool/index.php?cmd=browse&category=3