Definition
Regiomontanus (1436-1476), born Johannes Müller von Königsberg, was a German astronomer, astrologer, and mathematician. He advanced trigonometry and made astronomical observations. Think of him as a 15th-century Neil deGrasse Tyson! 🔭 He designed astronomical instruments and improved navigation techniques. His work helped pave the way for the Age of Exploration. Regiomontanus's precision was revolutionary.