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.

Modern versions[edit]

In 2013, Matthew Dockrey created a replica celatone, using notes from a version created by Samuel Parlour. From April 2014, Dockrey's celatone will be on display in the Greenwich Observatory in Greenwich, London.

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