Image © 2006 The Living Earth/livingearth.com
Earth and Moon Viewer
If Earth appeared like this as seen from the moon, how would the moon would appear from Earth? To find out, see Earth and Moon Viewer.
Also, check out this applet simulation of Earth, moon, and Sun, including the phase of the moon (Press the "Animate" button to start the motion, and press the same button, which will now say "Stop," to stop the motion whenever you like).
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PhET: Projectile Motion
Once you have clicked on the "simulation" link below, be sure to read the Java Security Advisory before running the simulation: To do that, click the "Read now" button on the yellow band near the top of the PhET page.
To explore particle trajectories, try PhET: Projectile Motion for a simulation of firing various objects out of a cannon. You can find out how the angle, initial speed, mass, and air resistance affect the path of the projectile. This item is part of a collection of simulations developed by the Physics Education Technology project (PhET) at the University of Colorado.
(This feature was updated on May 5, 2013.)