Celatone

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.

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

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 Greenwich Observatory in Greenwich, London.

gollark: Am I supposed to be seeing something other than an abstract color squiggle?
gollark: It's obviously the letters Qih81e.
gollark: Kind of worrying given that they're going into self-driving cars and stuff.
gollark: According to my calculations, you see, that would be bad.
gollark: I wonder if the neural networks trained for image recognition and stuff have similar types of weird glitch (obviously not exactly the same problems, but similar classes of thing).

See also

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.
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