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)!
This simulation can be used to illustrate kepler's 2nd law,too.
The # of trace points is the same (mean the same time interval), howevwr, the angle spread out is different.
It move much faster when it is closer to the earth, it move slower when it is far away from the earth.
However, the area is the same (from center of the earth, to both end of the trace)