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.
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 has been on display in the Greenwich Observatory in Greenwich, London.
- 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.
- 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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