Background
Petrus Ryff was born in Basel, Switzerland. He was the son of Daniel Ryff (1529–1612), and Ursula Zimmermann, and the grandnephew of Basler chronicler Fridolin Ryff.
Astronomer historian mathematician
Petrus Ryff was born in Basel, Switzerland. He was the son of Daniel Ryff (1529–1612), and Ursula Zimmermann, and the grandnephew of Basler chronicler Fridolin Ryff.
University of Basel.
Petrus Ryff enrolled in the University of his hometown in 1569. He received the Baccalaureus in 1572 and the Magister Philosophiae degree in 1576. He continued to study Medicine, following the lectures of Theodor Zwinger, Thomas Erastus, Felix Plater, and Johann Nicolaus Stupanus.
He was awarded the degree of Medical Doctor in 1584.
After that he practiced medicine for a few years, until he succeeded Christian Wursteisen as Professor of Mathematics at the University of Basel in 1586, a position he held until his death in 1629. In 1596 he became a Consultant of the School of Medicine, where he was an active member and 7 times Dean.
He was the author of several books of mathematics, astronomy, and astrology. Among the last is a prognostication for 1594.
However, Petrus Ryff is best remembered for continuing and publishing the Basler Chronicles his granduncle Fridolin Ryff maintained between 1514 and 1541.
He continued the chronicles from 1543–1585, and in 1585 he published the chronicles. The Basler Chroniken were edited and re-published in 1872 by the Historische und Antiquarische Gesellschaft zu Basel. They provide an invaluable source of information about the history of Basel, and that part of Europe in the 16th century.