Stars and Shadows

http://www.schoolsobservatory.org.uk/astro/esm/shadows.shtml

http://www.westlake.k12.oh.us/lbmslibrary/8sc/shadowmovement.htm

http://www.engineeringinteract.org/teachers5.htm

http://www.tki.org.nz/r/science/day_night/index_e.php

http://www.exploratorium.edu/science_explorer/sunclock.html

http://education.nacse.org/Curriculum/earth_star.html