Some useful resources from Nasa: http://apod.nasa.gov/apod/lib/edlinks.html

Nasa picture of the day: http://apod.nasa.gov/apod/archivepix.html

Daily email about the picture of the day: http://apodemail.appspot.com

Stellarium is a free open source planetarium for your computer :  http://www.stellarium.org

A sky-map website to check what you can observe in the evening: http://www.skymaps.com/downloads.html

Some useful astronomy simulations: http://astro.unl.edu/animationsLinks.html

Library guides:

http://libraryguides.marlboro.edu/astronomy

Bighorn Medicine Wheel

http://solar-center.stanford.edu/AO/bighorn.html