Johannes Stadius

Johannes Stadius or Estadius (Dutch: Jan Van Ostaeyen; French: Jean Stade) (ca. 1 May 1527 – 17 June 1579), was a Flemish astronomer, astrologer, and mathematician. He was one of the important late 16th-century makers of ephemerides, which gave the positions of naturally occurring astronomical objects as well as artificial satellites in the sky at a given time or times.

Born Jan Van Ostaeyen in the town of Loenhout (Loennouthesius, meaning 'from Loenhout', is sometimes appended to his Latin surname) in the Duchy of Brabant, Stadius grew up in the Schaliënhuis on the old Dorpsstraat, which was one of the oldest houses in Loenhout (today a tavern and restaurant). Not much else is known regarding his youth besides the fact that his parents were not married to each other.

After receiving his education at the Latin school of Brecht, Stadius studied mathematics, geography, and history at the Old University of Leuven, where one of his teachers was Gemma Frisius. After completing his studies, he became a professor of mathematics at his alma mater. In 1554 he left his home country and travelled to Turin, where he enjoyed the patronage of the powerful Duke of Savoy.

Stadius subsequently worked in Cologne, Brussels and Paris. In Paris, he debated with the trigonometrist Maurice Bressieu of Grenoble and made astrological predictions for the French court. In his Tabulae Bergenses (1560), Stadius calls himself both royal mathematician (of Philip II of Spain) and mathematician to the Duke of Savoy.[1]

...
Wikipedia