Reflecting Circle

Reflecting Circle

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Credit: NYPL/SCIENCE SOURCE/SCIENCE PHOTO LIBRARY

Caption: A reflecting circle, used to measure longitude by calculating the distance between the moon and a nearby star. German astronomer Johann Tobias Mayer developed the device, which was improved upon by French physicist Jean-Charles Borda in the 1780s.

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Keywords: art, artwork, astronomical, astronomy, borda, bw, device, diagram, drawing, historic, historical, history, illustration, instrument, longitude, mayer, reflecting circle, tool

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