Jupiter, for one, had four objects orbiting it, and these four objects thus did not have a center of rotation ... Galileo first put forth his observations on the moons of Jupiter in his book Siderius Nuncius. He studied Jupiter over the course of a month and was able to show the movement of the satellites around Jupiter.
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galileo.rice.edu/lib/student_work/astronomy95/jupiter.h...
galileo.rice.edu/lib/student_work/astronomy95/jupiter.html
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Educational Space Art by Walter Myers ... Jupiter's four largest satellites, also known as the "Galilean" satellites since they were first observed by the Italian astronomer Galileo over 400 years ago, are worlds in their own right. Top row, left to right, in order from their distances from Jupiter, are:
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www.arcadiastreet.com/cgvistas/jupiter_025.htm
www.arcadiastreet.com/cgvistas/jupiter_025.htm
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Probably the most significent contribution that Galileo Galilei made to science was the discovery of the four satellites around Jupiter that are now named in his honor. Galileo first observed the moons of Jupiter on January 7, 1610 through a homemade telescope.
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www2.jpl.nasa.gov/galileo/ganymede/discovery.html
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This applet displays Jupiter and the four main satellites ( Io, Europa, Ganymede and Callisto) in realtime as seen from Earth. The distances of the satellites from Jupiter are in proportion to that of the real Jovian system.
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www2.jpl.nasa.gov/galileo/jupsat/
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Jupsat Pro is a utility for Windows PCs which provides a range of information on Jupiter and graphically displays the planet (including its Great Red Spot) and the positions of its four main satellites, Io, Europa, Ganymede and Callisto (in real time).
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www.nightskyobserver.com/JupSatPro/
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Sky Notes - Transit of Venus, 2004 June 08 ... Venus headed for the Sun ... There are now only 5 days before the great day.
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www.orcadian.co.uk/skynotes/archive25.htm
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Jewitt estimates that Jupiter might have 100 satellites down to the 1-kilometer range, though he stresses that this is just a guess. Countless smaller rocks and bits of dust are in the planet's gravitational clutches. ... Jupiter has four large satellites, too, called the Galilean moons for their discoverer. The largest is...
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www.space.com/scienceastronomy/jupiter_moons_030310.htm...
www.space.com/scienceastronomy/jupiter_moons_030310.html
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Probably the most significent contribution that Galileo Galilei made to science was the discovery of the four satellites around Jupiter that are now named in his honor. ... These observations also established that there are not only three, but four, erratic sidereal bodies performing their revolutions around Jupiter."
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www.solarviews.com/eng/galdisc.htm
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Try to imagine what must have gone through Galileo Galilei's mind one January evening in 1610 when he first realized that the four points of light he saw through his new telescope were, in fact, worlds circling Jupiter. ... Jupiter with three of its Galilean satellites (from lower left to upper right): Io, Europa,
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www.skyandtelescope.com/observing/objects/planets/33070...
www.skyandtelescope.com/observing/objects/planets/3307071.html?page=1&c=y
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