On This Day

Historical Events in January 1610

DiscoveryHistoric Discovery

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

Astronomer and Physicist Galileo Galilei
Astronomer and Physicist
Galileo Galilei
  • Jan 8 Simon Marius. a German astronomer, independently discovers the first three moons of Jupiter one day after Galileo