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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / UIG / Universal History Archive |
Taille de l’image : | 2811 px × 3115 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |