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

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Photo credit: © Photo12/Ann Ronan Picture Library / Alamy / Afripics
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Keywords: /, 1539, altitude, antwerp, apian, astronomy, cosmographia, dials, dials., instrument, mathematical, measurement, measuring, peter, ring, sun, time