[zeebee]

Here is a page that shows the positions of the largest 4 moons of Jupiter at any time. It’s very cool to watch through a telescope since the moons travel so fast you can often see them orbiting if one passes another or occults or eclipses.

http://www.skyandtelescope.com/observing/objects/javascript/jupiter

[ETL]

Here is a page that shows the positions of the largest 4 moons of Jupiter at any time. It’s very cool to watch through a telescope since the moons travel so fast you can often see them orbiting if one passes another or occults or eclipses.

You never actually 'see' them moving. It can take many minutes to detect the slightest change in position.