Celatone

Using of celatone.

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 has been on display in the Greenwich Observatory in Greenwich, London.

See also

• Longitude prize

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"

References

• Sobel, Dava (1995). Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time. Penguin. ISBN 0-14-025879-5. 

Galileo Galilei
Scientific career	Observational astronomy Galileo affair Galileo's escapement Galilean invariance Galilean moons Galilean transformation Leaning Tower of Pisa experiment Phases of Venus Celatone Thermoscope
Works	The Assayer De Motu Antiquorum Dialogue Concerning the Two Chief World Systems "Discourse on the Tides" "Letter to the Grand Duchess Christina" Sidereus Nuncius Two New Sciences
Family	Vincenzo Galilei (father) Michelagnolo Galilei (brother) Vincenzo Gamba (son) Maria Celeste (daughter) Marina Gamba (mistress)
Related	"And yet it moves" Villa Il Gioiello Galileo's paradox Sector Museo Galileo Galileo's telescopes Tribune of Galileo
Popular culture	Life of Galileo (1943 play) Lamp At Midnight (1947 play) Galileo (1968 film) Galileo (1975 film) Starry Messenger (1996 book) Galileo's Daughter: A Historical Memoir of Science, Faith, and Love (1999 book) Galileo Galilei (2002 opera) Galileo's Dream (2009 novel)