Georg von Peuerbach, (1421—1461), was an Austrian mathematician and astronomer instrumental in the European revival of the technical understanding of the astronomical ideas of Ptolemy (fl. c. ad 140) and the early use of sines in Europe.
Peuerbach’s best-known work, the Theoricae novae planetarum (1454; “New Theories of the Planets”), began as lectures to the Viennese “Citizens’ School” (Bürgerschule), which Regiomontanus copied in his notebook. An influential university textbook, the Theoricae novae planetarum eventually replaced the widely used, anonymous 13th-century Theorica planetarum communis (the common “Theory of the Planets”). By the late 17th century, this textbook had appeared in more than 50 Latin and vernacular editions and commentaries, while introducing such students as Nicolaus Copernicus (1473–1543), Galileo Galilei (1564–1642), and Johannes Kepler (1571–1630) to an updated and simplified version of Ptolemy’s Almagest that gave a physical interpretation to its mathematical models.
www.britannica.com/biography/Georg-von-Peuerbach 