Measuring the altitude of the sun with ring dials. From Peter Apian 'Cosmographia', Antwerp, 1539

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
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Keywords: 1539, altitude, antwerp, apian, archival, archive, cosmographia, dials, dials., historical, history, instrument, mathematical, measurement, measuring, peter, ring, sun, surveying