Georg Purbach
Georg Purbach (May 30, 1423 – April 8, 1461) was an Austrian astronomer and mathematician. He is credited with the invention of several scientific instruments, including the regula, the geometrical square, and the "Jacob's Staff."
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May 30 - 1423 - April 8 - 1461 - Austria - Astronomer - Mathematician - Geometrical square - Jacob's Staff
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Purbach was the author of a seminal work in astronomy, Theoricae novae planetarum.
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