Hevelius observing through refracting telescope on stand fitted with quadrant and plumb-bob so altitude of object observed could be noted. From Johannes Hevelius "Selenographia" Gedani (Gdansk/Danzig) 1647

- Image ID: HTMKNF
Hevelius observing through refracting telescope on stand fitted with quadrant and plumb-bob so altitude of object observed could be noted. From Johannes Hevelius "Selenographia" Gedani (Gdansk/Danzig) 1647
Photo 12 / Alamy Stock Photo
Image ID: HTMKNF