Editing Celatone

{{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.

== 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==
* {{cite book | author=Sobel, Dava | authorlink=Dava Sobel | title=[[Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time]] | publisher=Penguin | year=1995 | isbn=0-14-025879-5}}

==External links==
* [http://brunelleschi.imss.fi.it/esplora/cannocchiale/dswmedia/simula/esimula1_2_3.html Video animation of a Celatone and its use in discovering the longitude for marine navigation]
* [http://www.attoparsec.com/artifacts/celatone.html Dockrey celatone]
* [http://cudl.lib.cam.ac.uk/view/MS-RGO-00014-00030/432 "Apparatus to render a telescope manageable on shipboard"]

{{Galileo Galilei}}
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[[Category:Astronomical instruments]]