SimSolar Galilean Moon Simulator  
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 Solar System Simulator
The registered version includes a feature-packed
Galilean Moon Simulator.
The four bright moons of Jupiter can be easily seen with a small
telescope or even a good pair of binoculars. The moon positions
are calculated for any selected date and time. Both the top-down
and edge-on views are displayed, providing a clear understanding
of the reason behind the strange, nightly rearrangement of the moons.