31 lines
1.1 KiB
Markdown
31 lines
1.1 KiB
Markdown
---
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title: "Celatone"
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chunk: 1/1
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source: "https://en.wikipedia.org/wiki/Celatone"
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category: "reference"
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tags: "science, encyclopedia"
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date_saved: "2026-05-05T09:40:16.196142+00:00"
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instance: "kb-cron"
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---
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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.
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== Modern versions ==
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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.
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== See also ==
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Longitude prize
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Galilean moons
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== References ==
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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.
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== External links ==
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Video animation of a Celatone and its use in discovering the longitude for marine navigation
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Dockrey celatone
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"Apparatus to render a telescope manageable on shipboard" |