Philipp Ludwig von Seidel
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Philipp Ludwig von Seidel (October 24, 1821 Zweibrücken, Germany – August 13, 1896, Munich) was a German mathematician.
In 1857, von Seidel decomposed the first order monochromatic aberrations into five constituent aberrations. They are now commonly referred to as the five Seidel Aberrations.
There is a lunar crater named after him.