%20IF%20102793.jpg)
Celatone
Sign in to savethumb|Using a celatone. thumb|Celatone by Matthew Dockrey. Museum at the Royal Observatory, Greenwich, UK. The celatone was a device invented by Galileo Galilei to observe Jupiter's moons with the purpose of finding longitude on Earth. It took the form of a piece of headgear with a telescope taking the place of an eyehole.
Article
4 sectionsContents
- Modern versions
- See also
- References
- External links
thumb|Using a celatone. thumb|Celatone by Matthew Dockrey. Museum at the Royal Observatory, Greenwich, UK. The celatone was a device invented by Galileo Galilei to observe Jupiter's moons with the purpose of finding longitude on Earth. It took the form of a piece of headgear with a telescope taking the place of an eyehole.
== Modern versions ==