Galileo, title page from Sidereus Nuncius (The Sidereal Messenger), Venice, 1610
In the Sidereus Nuncius, Galileo announced to the world the discoveries made with his new telescope or "perspicilli," especially the "four planets" circling Jupiter--in fact, Jupiter's moons--which he names the Medicean stars for his patron, Cosimo II de Medici.
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