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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 7:41  
clear_day Transit: 11:47  
SunsetSet: 15:53 south
sleep NighttimeWhat's Visible Now?

Position of Jupiter's Galilean Moons

Using this application it is possible to compute and visualize the positions of Io, Europa, Ganymede, Callisto - also known as the Galilean Satellites of Jupiter - in real time or at any given time in the past and in the future.

Time:  Europe/London
Keep Jupiter at the Center
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Direct view is presenting the image as it would be seen through a binocular or any other erect-image system. Inverted view is typically provided by a Newtonian reflector telescope. Mirrored view is presenting the image as it would be seen through a Schmidt–Cassegrain/Maksutov/Refractor telescope with a diagonal adapter.


The algorithms to compute the positions of the Galilean Moons used in this application are based on the jsaa project (Javascript Implementation of Astronomical Algorithms) which, in turn, is based on algorithms published by Jean Meeus on his Astronomical Algorithms book.