University of Colorado
University of Colorado: Confluence Creations: Chaco Canyon Tour
Take a tour of the Chaco Canyon archaeological site. The map takes you to the many dwellings and important astronomical sites. Virtual tours are available if you have Quick Time.
University of Utah
University of Utah: Aspire: Seasons Exercise
In this activity, use seasons to determine your location. Click on the different dates to view the earth's shadow at different times of the year from the sun's position.