Georg Galgemair was a German mathematician and astrologer.
He was born into the family of the burgomaster of Donauwörth, was a pupil of Philip Apian, and then a master of mathematics at the University of Tübingen in 1585. After completing his studies, Galgemair began teaching at Lauingen in 1588.
His work on proportional circles led to the development of gnomonics. In the history of science, Galgemair is known for his works on mathematical instruments. As a calendar maker, he succeeded in 1606 in obtaining an imperial privilege for his calendars.
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