Celatone
Navigational aid reliant on tracking Jupiter's moons in the sky
![](http://upload.wikimedia.org/wikipedia/commons/thumb/8/83/Celatone_%28ricostruzione%29_IF_102793.jpg/220px-Celatone_%28ricostruzione%29_IF_102793.jpg)
![](http://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
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
- Longitude prize
- Galilean moons
References
- 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.
External links
- Video animation of a Celatone and its use in discovering the longitude for marine navigation
- Dockrey celatone
- "Apparatus to render a telescope manageable on shipboard"
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Galileo Galilei
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- Galileo's escapement
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- Galilean transformation
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- De motu antiquiora (1589–1592)
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- Letter to Benedetto Castelli (1613)
- "Letter to the Grand Duchess Christina" (1615)
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- Galileo's Daughter: A Historical Memoir of Science, Faith, and Love (1999 book)
- Galileo Galilei (2002 opera)
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