celatone
{{Short description|Navigational aid reliant on tracking Jupiter's moons in the sky}}
File:Celatone (ricostruzione) IF 102793.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
References
- {{cite book | author=Sobel, Dava | authorlink=Dava Sobel | title=Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time | publisher=Penguin | year=1995 | isbn=0-14-025879-5}}
External links
- [http://brunelleschi.imss.fi.it/esplora/cannocchiale/dswmedia/simula/esimula1_2_3.html Video animation of a Celatone and its use in discovering the longitude for marine navigation]
- [http://www.attoparsec.com/artifacts/celatone.html Dockrey celatone]
- [http://cudl.lib.cam.ac.uk/view/MS-RGO-00014-00030/432 "Apparatus to render a telescope manageable on shipboard"]
{{Galileo Galilei}}
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