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Celatone
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{{Short description|Navigational aid reliant on tracking Jupiter's moons in the sky}} [[File:Celatone (ricostruzione) IF 102793.jpg|thumb|Using of celatone.]] [[File:Celatone01.jpg|thumb|Celatone by Matthew Dockrey. Museum at the Royal Observatory, Greenwich, UK.]] 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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