Seasons:

description: This is a Flash animation. Please make sure you have the Flash plugin installed (see the FAQ / Help for more information). This animation shows the earth orbiting the sun and shows the location in its orbit, and dates for the various seasons. In addition, it shows the declination of the sun throughout the year, as well as how a constant beam of sunlight gets spread out and concentrated as the sun changes altitude. An animation with a lot of information!
category: Solar System
requires: Macromedia Flash:
pedagogy: Animation

Lunar Phases:

description: This demo is a Java applet that shows a top down and simultaneous sky view of the moon as it goes through its phases. The applet works, but is still under some development, so some of the features are not yet implemented.
category: Solar System
requires: Java™ technology (any standard browser)
pedagogy: Animation/Interactive demo

Kepler's Laws of Planetary Motion:

description: This demo is composed of three sub-demos -- one for each of Kepler's laws. The first sub-demo illustrates the concept of ellipses. The second sub-demo shows that equal areas are covered in equal times. The last sub-demo is a JavaScript calculator that allows you to calculate the orbital distance of a planet in AU from its period in years, or visa-versa. All demos use Java, JavaScript, or both.
category: Solar System, Kepler's Laws
requires: Java™ technology and JavaScript (any standard browser)
pedagogy: Animation/Interactive demo

Retrograde Motion:

description: This demo shows Mars go through a retrograde loop as the Earth overtakes it in its orbit. The demo shows a top-down, and sky view.
category: Solar System
requires: Java™ technology (any standard browser)
pedagogy: Animation

Doppler Effect:

description: Watch the wavelength increase and decrease (and the color of the "wave" change) as the source moves away from you or toward you. Increase or decrease the speed to increase or decrease the effect.
category: Light
requires: Java™ technology (any standard browser)
pedagogy: Interactive demo

Spectral Lines and Kirchoff's Laws:

description: This is another demo that contains two sub-demos. The first sub-demo shows Kirchoff's Laws and the formation of absorbtion lines, emission lines, and continuum emission. The second sub-demo allows the user to experiment with different wavelengths of light to discover how absorbtion and emission lines are formed.
category: Light
requires: Java™ technology and JavaScript (any standard browser)
pedagogy: Interactive demo

Java and all Java-based marks are trademarks or registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries.