NHAS - Today in Astronomy History

	1610	Italian astronomer Galileo Galilei discovers the last of Jupiter's four largest moons: Ganymede. He had found the other three: Io, Europa, and Callisto six nights earlier. Galileo named these moons J1, J2, J3 and J4. Several nights later, they were "discovered" again, independently, by Dutch astronomer Simon Marius. Marius named them after the sons and daughters of the Greek gods: Io, Europa, Callisto and Ganymede. When Marius announced his discovery he was publicly ridiculed by the followers of Galileo. These first four moons are still known as the Galilean Moons, however, the work of Marius was later recognized by officially giving them the names he had selected.
	1986	Voyager mission scientist Stephen Synnott discovers Desdemona and Belinda, moons of Uranus, in images returned from the Voyager 2 spacecraft.
	1986	Voyager mission science team discovers Cressida, a moon of Uranus, in images returned from the Voyager 2 spacecraft.