![](Https://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Celatone_%28ricostruzione%29_IF_102793.jpg/220px-Celatone_%28ricostruzione%29_IF_102793.jpg)
![](Https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Celatone01.jpg/220px-Celatone01.jpg)
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
[edit]In 2013, Matthew Dockrey created a replica celatone, using notes from a version created by Samuel Parlour. From April 2014 to January 2015, Dockrey's celatone was on display in the Royal Observatory, Greenwich in east London.
See also
[edit]References
[edit]- Sobel, Dava (1995). Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time. Penguin. ISBN 0-14-025879-5.