Gemma Frisius

Gemma Frisius (Known as "Jemme Reinerszoon")

Mathematician, Cartographer, Physician, Inventor of Surveying by Triangulation

Born Dec 09, 1508

Dokkum (Friesland), Netherlands

Passed Away May 25, 1555 Leuven, Belgium

Lifespan 46 years old

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Notice / Correction

"By measuring the angles between distant towers, the surveyor maps the whole kingdom without leaving his station."

Archival Overview

Pioneering mathematician, astronomer, and instrument-maker at the University of Leuven who invented surveying by triangulation and was the first to propose using clocks to determine longitude at sea.

Biographical Record

Studying medicine and mathematics at the University of Leuven, Frisius became a distinguished professor of medicine. In his workshop, he manufactured the most precise celestial globes, astrolabes, and astronomical rings of Renaissance Europe.

In his 1533 treatise Libellus de locorum describendorum ratione, Frisius published the revolutionary method of topographical triangulation, which became the foundational technique of modern cartography. In De Radio Astronomico (1545), he illustrated the first camera obscura; among his pupils was Gerardus Mercator.

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Rest in Peace Forever remembered and cherished Your legacy lives on in all of us With deep gratitude for your life and light

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Final Resting Place

Perpetual Memorial

Saint Michael's Church precinct
Leuven, Belgium

                         GPS: 50.8797, 4.7008                    

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