Gemma Phrysius or Frisius (1508-1555), Dutch mathematician, holding an adjustable ring dial for determining the altitude of the sun for calendar calculations. From Peter Apian "Cosmographia", Antwerp, 1539. Engraving

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Photo credit: © Photo12/Ann Ronan Picture Library / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: 16th, century, instrument, mathematical, maths, measurement, netherlands, numbers, science, scientist