Push the Start button to start/restart the simulation from the beginning
(Jan 1, 2012).
Push Pause to pause the simulation. Push Play to resume a paused
simulation.
Push Show Trails to show where each planet has been.
Push + to zoom in. Push - to zoom out.
To pause at conjunction events, click on Show.
While in this mode, click on Play to resume the simulation and stop at
the next event.
You can choose one of two different integration methods:
Midpoint (Leapfrog) and Hermite.
The accuracy of the simulation is determined by the step size dt.
the warp parameter controls the speed of the simulation (without
compromising quality).
Click here for older version.