Peter Saxonious (August 16, 1591 - September 16, 1625) was a German mathematician and astronomer. He studied at the Altdorf Academy  with the astronomer, mathematician and instrument maker Johann Praetorius, eventually succeeding him as professor of mathematics. After the academy became a university in 1624, two chairs of mathematics were set up, Saxonius took the chair for higher mathematics, accompanied by Johann Christoph Odontius as professor of lower mathematics. Saxonius died a year later, leaving a planned series of annotated works by classic Greek mathematicians unfinished. His only publication was a posthumous written Maculae solares ex selectis observationibus Petri Saxonii Holsati on 1616 observations of sunspots.

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