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Galileo Galilei, Drawings of the sunspots


Galileo Galilei (1564-1642)
Drawings of the sunspots, ca. 1612
Florence, Biblioteca Nazionale Centrale, Ms. Gal. 57, f. 69r

Using a brilliant projecting device, the so-called helioscope, Galileo managed to draw the sunspots with almost photographic accuracy, yet without risking damaging his eyesight through direct observation of the Sun's disc.