On This Day

What Happened in January 1610

Historical Events

Historic Discovery

Jan 7 Galileo Galilei discovers the first three moons of Jupiter: Io, Europa & Ganymede

  • Jan 8 Simon Marius. a German astronomer, 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)