Dutch astronomer Willem de Sitter, born May 6, 1872, studied mathematics and physics at the University of Groningen, developing an interest in astronomy there and furthering it with work at Cape Observatory in South Africa. In 1908, he was appointed professor of astronomy at Leiden University, becoming the director of the Leiden Observatory in 1919.Continue reading “May 6, 1872: The birth of Willem de Sitter”
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