In 1573 he came to
Wittenberg, proposing to
Johannes Praetorius an approximation of
pi as \pi \approx \tfrac {355} {113} (now known as
milü, as named by its first discover, the Chinese mathematician
Zu Chongzhi). In 1575 he supported
Georg Joachim Rheticus in his
trigonometric tables. The next year they went to
Kaschau in
Hungary where Rheticus died. Thus, Otho inherited the
De revolutionibus manuscript of
Nicolaus Copernicus that Rheticus had published in 1543 in
Nuremberg. Otho became Professor for mathematics in Wittenberg, but when the rulers of Saxony did not support the tables, he moved to
Heidelberg where Elector
Friedrich IV sponsored the '’Opus Palatinum de Triangulis’’ in 1596. == Work ==