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.
- Opus Palatinum de Triangulis, 1596 (original manuscript available at http://www.bl.uk/manuscripts/FullDisplay.aspx?ref=Harley_MS_1720 )
- De triangulis globi sine angulo recto libri quinque
- Cantor, Moritz: Vorlesungen über die Geschichte der Mathematik 1550-1600 Kapitel 68
- Hilfstein, Erna (1986). "Was Valentinus Otto a Professor at the Univ. of Heidelberg?" (PDF). Organon. 22-23: 221–225..
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