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Jovian Moons

Four of the moons of Jupiter are easily visible in binoculars or a small telescop: Io (I), Europa (E), Ganymed (G), and Callisto (C). They move within several hours to several days around the planet Jupiter. During this revolutions, they cast there shadows on the surface of the gas planet (shadow events), which can be observed in amateur telescopes. In steady air with good seeing, one can even see the small disks of the moons in front the limb of Jupiter (transit). But also if you have no telescope at hand, it is nice to follow the dance of the Jovian moons. You can find out about to current position of the moons with help of the moon position charts, included in the following table. The position of the satellites are show relativ to Jupiter (|J|) as they appear through binoculars, hence West is to the right and East to the left. Detailed view of the Jupiter system can be found in the section Apparent View.
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Glossary:

Jovian Moons
The four brightest moons of Jupiter: Io, Europa, Ganymed, and Callisto.
Shadow
During this event, the moon casts its shadow on the disk of Jupiter. The movement of the tiny black spot can easily been tracked giving good seeing and a typical amateur telescope.
Eclipse
If a moon enters the shadow cone of Jupiter, it gets eclipsed and disappears pretty fast.
Occulation
An occultations is the disappearance of a moon behind the disk of Jupiter. This is more hardly to observe, since the colors and brighness' of the two limb are similar (except of a disappearance on the dark limb of Jupiter, but in this situation the moon is usually eclipsed).
Transit
A transit is the crossing of the disk of Jupiter by a moon.
Eastern/ western Elongation
Most extreme points on the orbit of the moons around the planet.
Inferior conjuction
The moon is closest to the disk center of the planet, and in front of the planet.
Superior conjuction
The moon is closest to the disk center of planet, but behind the planet.

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