Projecting the sun's image through a refracting telescope onto a screen in a darkened room (camera obscura) in order to study sunspots. From Selenographia by Johannes Hevelius (Gedani,Gdansk. Danzig,1647). Engraving | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / UIG / Universal History Archive |
Bildgröße: | 2811 px × 3115 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |