Gemma Frisius
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About
Dutch mathematician and cartographer known for applying mathematics to global surveying and navigation. He is credited with the invention of the cross-staff, the astrolabe, and astronomical rings.
Before Fame
He studied at the Katholieke Universiteit Leuven and later joined the faculty at the University.
Trivia
He began producing globes and mathematical instruments while he was a student.
Family Life
After his death, his son, Cornelius Gemma, edited volumes of his work and continued his research.
Associated With
He was a contemporary of Tycho Brahe, who was impressed with the quality of his instruments.
