Valentinus Otho (also Valentin Otto; born around 1545–46 possibly in Magdeburg – 8 April 1603 in Heidelberg) was a German mathematician and astronomer.
(now known as milü, as named by its first discover, the Chinese mathematician Zu Chongzhi).
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.
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