Planisphere disc, 18th century

Planisphere disc, 18th century

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Credit: THE LIONEL PINCUS AND PRINCESS FIRYAL MAP DIVISION/NEW YORK PUBLIC LIBRARY/ SCIENCE PHOTO LIBRARY

Caption: Planisphere disc. 18th-century planisphere disc providing horizon alignment and co-ordinates for Earth's western hemisphere. A planisphere is a circular chart with adjustable rotating discs that are moved to show the positions of the stars at particular times or locations on the Earth. This disc includes the horizon, running from lower left to upper right. It was published in 1757 by Samuel Dunn and William Owen. Dunn, a British mathematician and amateur astronomer, was credited in 1757 as the inventor of the 'universal planispheres'.

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Keywords: 1700s, 1757, 18th century, adjustable, alignment, astronomical, astronomy, britain, british, cartography, celestial map, circular chart, co-ordinates, diagram, display, england, english, europe, european, geographical, geography, grid, historical, history, horizon, invention, london, map, monochrome, planisphere, planispheres, rotating disc, samuel dunn, uk, united kingdom, universal planisphere, william owen

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