Johann Müller; Regiomontanus
Astronomer, born Konigsberg, Coburg, Germany, 1436; died Rome, Italy, 1476.
Arriving in Rome, 1461, he studied the planets and searched for Greek manuscripts.
In Venice he discovered part of the Greek Arithmetic of Diophantus, continued his observations, refuted the attempted quadrature of the circle by Cuse, and computed a calendar with the location of sun and moon, the eclipses, and the dates of Easter for the next 30 years.
Müller went to Nuremberg, 1471, to establish an observatory for the determination of the astronomical constants, and to publish astronomical literature.
He was recalled to Rome to settle the reform of the calendar, and was made Bishop of Ratisbon.
New Catholic Dictionary