celatone

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noun

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.

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Meanings

nouncelatone (plural celatones)

plural celatones

  1. historicalA 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.

    Galileo had designed a special navigation helmet for finding longitude with the Jovian satellites. The headgear—the celatone—has been compared to a brass gas mask in appearance, with a telescope attached to one of the eyeholes.

    1995, Dava Sobel, Longitude
Cite this entry
APA

celatone. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/celatone

MLA

“celatone.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/celatone. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “celatone,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/celatone.

Source: celatone on Wiktionary, CC BY-SA 4.0.