Gemma Frisius, 1545 (published), A drawing by Gemma Frisius showing how he used a pinhole within a darkened room to study the solar eclipse of 1544, Engraving, Private collection, LL/31674
Gemma Frisius 1545 (published) A drawing by Gemma Frisius showing how he used a pinhole within a darkened room to study the solar eclipse of 1544