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出典:Wiktionary
celatone (複数形 celatones)
出典:Wikipedia
出典:『Wikipedia』 (2010/05/05 00:02 UTC 版)
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.
celatone