Columbia subject headings:
Astronomers--Biography.
Mathematicians--Biography.
Regiomontanus, Joannes, 1436-1476--Homes and haunts--Italy.
Harvard subject headings:
Astronomers--Biography
Mathematicians--Biography
Regiomontanus, Joannes, 1436-1476--Homes and haunts--Italy.
Princeton subject headings:
Regiomontanus, Joannes, 1436-1476.
Religion and science--History.
Sixtus IV, Pope, 1414-1484.