Georg Joachim Rheticus

Rheticus
Born16 February 1514
Feldkirch, Archduchy of Austria, Holy Roman Empire
(present-day Austria)
Died4 December 1574(1574-12-04) (aged 60)
Kassa, Kingdom of Hungary, Habsburg monarchy
(present-day Slovakia)
Alma materUniversity of Wittenberg
Known forTrigonometric tables
Scientific career
FieldsMathematician and astronomer
InstitutionsUniversity of Wittenberg (1536–42)
University of Leipzig (1542–51)
Academic advisorsNicolaus Copernicus
Notable studentsSebastian Dietrich, Valentin Otto, Caspar Peucer, Valentin Steinmetz

Georg Joachim de Porris, also known as Rheticus (/ˈrɛtɪkəs/; 16 February 1514 – 4 December 1574), was a mathematician, astronomer, cartographer, navigational-instrument maker, medical practitioner, and teacher. He is perhaps best known for his trigonometric tables and as Nicolaus Copernicus's sole pupil. He facilitated the publication of his master's De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres).

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