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Galileo Galilei, Fasi lunari
Galileo Galilei, Moon phases

Watercolor; 25,5x18 cm
Florence, Biblioteca Nazionale Centrale, Ms. Gal. 48, f. 28r

The 6 watercolors show one of the most important astronomical discoveries described in the Sidereus Nuncius, that’s to say that the Moon’s surface is "uneven, rough, and strewn with cavities and protuberances, not unlikely than the face of the Earth".