Galileo Galilei, Drawings of the sunspots

Sidereus Nuncius

Autograph diary of observations of Jupiter

Letter to Belisario Vinta

Drawings of the sunspots

Istoria e dimostrazioni intorno alle macchie solari

Exploded replica of Galileo’s telescope

Octagonal telescope with seven tubes

Biconcave eyepiece lens

Telescope with four tubes

Metal shapes for telescopes and microscopes

Measuring bundle

Binocular telescope

Galileo Galilei, Drawings of the sunspots

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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.