Jupiter Moons' Applet

This applet shows the current positions of the four biggest Jupiter moons.

Notes:

North is up in the diagram, so the view makes sense when you are North of Jupiter seeing it with binoculars.
The applet shows GMT time, not your local time.
To test the applet, I've looked at the moons about half a dozen times with binoculars, and apparently the applet gets the moons' positions more or less right.
I've seen just one eclipse of a Jupiter moon, with a 102 mm refractor, and it happened ten minutes after the time predicted by this applet. So if you are planning to observe eclipses, get accurate predictions elsewhere.
I calculate the positions by feeding TU to the Meeus algorithms, which expect to find TDT. Therefore, predictions for past centuries are very inaccurate.
This applet has a kind of guarantee: if you see a shadow transit where the applet says you shouldn't, complain fiercely, and I'll try to fix it. If you don't see the shadows where it says they should be, AND your scope has less than 200 mm aperture, complain politely.
The sizes of the dots in the applets have a crude relationship with the sizes of the satellites. They're different merely for artistic effect.
The Spanish version of this applet comes in a pop-up window, so it can be resized.

Self-link: http://purl.oclc.org/net/jordi/castro/satgali.en.html
email: jordimastrullenque at yahoo dot com