Historical Events
Galileo Discovers Jupiter’s Moons
Jan 7 Galileo Galilei discovers the first three moons of Jupiter: Io, Europa and Ganymede
- Jan 8 German astronomer Simon Marius independently discovers the first three moons of Jupiter one day after Galileo
- Jan 13 Galileo Galilei discovers Callisto, 4th satellite of Jupiter
Famous Birthdays
- Jan 13 Maria Anna of Austria, Electress of Bavaria (d. 1665)
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