Galileo's Discovery of Jupiter's Moons (1610)

Name: Galileo's Discovery of Jupiter's Moons (1610)
Start: 1610

Type Event Region Italy Time 1610

In January 1610 Galileo Galilei observed Jupiter through his self-made telescope, finding four satellites that moved with Jupiter, which he named the…

Timeline

1610Padua · ItalyWhile observing Jupiter, Galileo spotted several small stars nearby; initially thought to be fixed stars, tracking them over successive nights revealed they moved as Jupiter's position changed.
1610Padua · ItalyBy mid-January Galileo confirmed four satellites orbiting Jupiter, and in March published Sidereus Nuncius announcing the discovery, naming them the Medicean Stars to win the support of the Grand Duke of Tuscany.

Sources

Sidereus Nuncius — Galileo Galilei (1610)
The Galileo Project: Jupiter's Moons https://galileo.rice.edu/sci/observations/jupiter_moons.html