Page "Galilean moons" Paragraph 9
from
Wikipedia
In 1605, Galileo had been employed as a mathematics tutor for Cosimo de ' Medici.
In 1609, Cosimo became Grand Duke Cosimo II of Tuscany.
Galileo, seeking patronage from his now-wealthy former student and his powerful family, used the discovery of Jupiter ’ s moons to gain it.
On February 13, 1610, Galileo wrote to the Grand Duke ’ s secretary:
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