Projecting the image of the Sun through a refracting telescope on to a screen in order to study sunpots. From Rosa Ursina by Christoph Scheiner Bracciano, 1630. Engraving. Editorial Stock Photo - Afloimages
Projecting the image of the Sun through a refracting telescope on to a screen in order to study sunpots. From Rosa Ursina by Christoph Scheiner (Bracciano, 1630). Engraving.