Gemma Frisius

Gemma Frisius was a Dutch physician, mathematician, cartographer, philosopher, and instrument maker. He created important globes, improved the mathematical instruments of his day and applied mathematics in new ways to surveying and navigation. Gemma's rings, an astronomical instrument, are named after him. Along with Gerardus Mercator and Abraham Ortelius, Frisius is often considered one of the founders of the Netherlandish school of cartography, and significantly helped lay the foundations for the school's golden age.

9 December 1508

Born on the same birth day (9 December): Antoine Étienne de Tousard • Conchita Supervía • Fiona MacDonald • Gideon Sa'ar • Junior Wells • Kara DioGuardi • Margaret Brundage • Mona Hanna-Attisha • Nick Hysong

Born in the same month (December 1508): Pietro Carnesecchi