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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Celatone | 1/1 | https://en.wikipedia.org/wiki/Celatone | reference | science, encyclopedia | 2026-05-05T09:40:16.196142+00:00 | kb-cron |
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"