For More Information...
About Stonehenge in England: http://sunearthday.nasa.gov/2005/locations/stonehenge.htm
About the solar alignments at El Karnak in Egypt: http://sunearthday.nasa.gov/2005/locations/elkarnak.htm
About the Big Horn Medicine Wheel in Wyoming: http://sunearthday.nasa.gov/2005/locations/bighorn.htm
About Jantar Mantar in India: http://sunearthday.nasa.gov/2005/locations/jantar_mantar.htm
About Chichen Itza in Mexico: http://sunearthday.nasa.gov/2005/locations/chichen_itza.htm
About Gaocheng in China: http://sunearthday.nasa.gov/2005/locations/gaocheng.htm
Eyes on the Sky: 400 Years of Telescope Development
This seven-part series of vodcasts produced for the 2009 International Year of Astronomy offer an excellent explanation of the evolution of telescopes.
Telescopes from the Ground Up
Explore the history of telescopes, from Galileo to NASA's Great Observatories.
