Mural quadrant, 17th century

Mural quadrant, 17th century

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Credit: ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY

Caption: Mural quadrant. This instrument, mounted on a wall (mural) and covering 90 degrees of angle (quadrant), is used to measure the positions of stars in the sky. The main part of the instrument is at lower left, with details of the parts across top and at right. This diagram is from 'Some Animadversions on the First Part of Hevelius' (1674) by English scientist Robert Hooke (1635-1703). This work was a criticism of a work a year earlier (Machina Coelestis, 1673) by the Polish astronomer Johannes Hevelius (1611-1687), where Hevelius described his observatory.

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Keywords: 1600s, 1674, 17th century, apparatus, artwork, astronomical, astronomy, black-and-white, criticism, device, diagram, english, equipment, european, historical, history, illustration, johannes hevelius, machina coelestis, monochrome, mural quadrant, quadrant, response, robert hooke, some animadversions on the first part of hevelius, technological, technology

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