1610 – ‪#Onthisday in ‪#history Galileo Galilei makes his 1st observation of the four Galilean moons: Ganymede, Callisto, Io and Europa, he was not able to separate to planet until the following day.
Justus_Sustermans_-_Portrait_of_Galileo_Galilei,_1636 (1) Jupiter_and_the_Galilean_Satellites
 
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