American Association of Physics Teachers
Com Padre Digital Library: Open Source Physics: Earth Orbit Model
Nicolaus Copernicus developed the theory of Earth's orbit around the sun demonstrated in this science simulation.
American Association of Physics Teachers
Com Padre Digital Library: Open Source Physics: Equinox Precession Model
Experience a science simulation illustrating the Copernican theory of Earth's orbit around the sun.
PBS
Pbs Learning Media: Galileo: Sun Centered System
In the early 1600s, most people believed that the Sun revolved around a stationary Earth. This video segment adapted from NOVA tells how Galileo proved that the Sun, not Earth, is at the center of our universe.
PBS
Pbs Learning Media: Galileo: Timeline of His Life
This illustrated timeline from the NOVA Web site turns back the clock to the late 1500's to relive the dramatic life of one of the world's most renowned scientists.