Celatone
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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.
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.
References
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"
Text derived from https://en.wikipedia.org/w/index.php?oldid=1316873634 under CC BY-SA 4.0; modifications have been made.