Move the mouse cursor onto the canvas can pause the motion, move out to continue;
Drag the slider bar to change the motion speed;
Click the Helicentric button to change between helicentric or geocentric system;
Click draw path to draw the orbit based on selected system.


Using the lowest speed to draw orbit path on geocentric system.

Test passed on the latest Chrome and Opera (2014-06-27)

Source Code under MIT license

Sun mercury venus earth mars jupiter saturn uranus neptune