Celatone

Using of celatone.

Celatone by Matthew Dockrey. Museum at the Royal Observatory, Greenwich, UK.

Thecelatonewas a device invented byGalileo Galileito observeJupiter's moonswith the purpose of findinglongitudeon 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 theRoyal Observatory, Greenwichin 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.ISBN0-14-025879-5.

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"