You can drag the satellite and simulate different trajectory.
You can also check the [b]show velocity[/b]  to change the velocity,too!

I just modify the satellite image (set draggable to true)!

translate strings in simulation to different language format before download
Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(3100.9kB):double click downloaded file to run it. (8 times by 4 users) , Download EJS source View EJS source