This is the coolest thing ever:
NASA J-Track 3D (You’ll need to allow popups and Java)
It tracks all the satellites currently orbiting the earth. This month’s Scientific American offered a quick introduction to the satellite system that powers XM, Sirius and WorldSpace. From there a quick search on Wikipedia revealed this article about geosynchronous satellites, as well as the above link to NASA.
I am just fascinated by this Java app; its amazing to see the Wikipedia article come to life visually. For example, the haze of satellites really close to the earth are the ones orbiting in Low Earth Orbit. If you zoom out a bit you’ll see a band of satellites, kinda like a ring of Saturn; these are the geostationary satellites. The Wikipedia article also mentions inclined orbits, where a satellite will seem to oscillate around a fixed point in the sky. By enabling orbital paths in the Java app (View -> Orbital Paths), you can see that the satellites just off the center of that ring do indeed oscillate across a fixed point on the earth’s surface!
Navigating to the Satellite -> Select menu will let you pick and choose any satellite on there. Everyday names like GPS, Hubble (abbreviated HST), DirectTV, and Sirius are on there. I’ve literally lost hours playing around with this thing!

