page_title: Celatone
hierarchical_section_title: Celatone
caption_attribution_description: English: Celatone by Matthew Dockrey. Brass and steel, antique spyglass. An interpretation of Samuel Parlour's 'apparatus to render a telescope manageable on shipboard', itself a reinvention of Galileo's celatone. As per Parlour's original design, the finder can be moved side to side, allowing the wearer to position it to match their interocular distance. The candle height is also adjustable. Museum at the Royal Observatory, Greenwich, UK.
context_page_description: 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.
context_section_description: 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.
caption: Celatone by Matthew Dockrey. Museum at the Royal Observatory, Greenwich, UK.
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