Category:Willem de Sitter

**Willem de Sitter**
	Dutch cosmologist (*1872 – †1934)
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Name in native language	Willem de Sitter;
Date of birth	6 May 1872; Sneek
Date of death	20 November 1934; Leiden
Place of burial	Westerveld (52°26′44.02″N 4°37′54.01″E);
Country of citizenship	Kingdom of the Netherlands;
Educated at	University of Groningen;
Doctoral advisor	Jacobus Kapteyn;
Doctoral student	Jan Woltjer (1918); Willem Hendrik van den Bos (1925); Dirk Brouwer (1927); Simon Cornelis van Veen (1927); Simon Cornelis van Veen; Coert Hendrik Hins; Pieter Kremer; August Juliaan Leckie;
Occupation	astronomer; mathematician; physicist; university teacher;
Employer	University of Groningen (1899–1908); Leiden University (Faculteit der Wiskunde en Natuurwetenschappen, Dutch ordinary professor, 1908–1934); University of Groningen (Faculty of Science and Engineering, Privatdozent, 1901–1908);
Member of	Royal Netherlands Academy of Arts and Sciences; American Academy of Arts and Sciences; International Astronomical Union; National Academy of Sciences (Foreign Associate of the National Academy of Sciences, 1929–);
Position held	rector magnificus of Leiden University;
Field of work	astronomy;
Native language	Dutch;
Child	Aernout de Sitter; Ulbo de Sitter;
Notable work	dark matter;
Award received	Gold Medal of the Royal Astronomical Society (1931); Bruce Medal (1931); Prix Jules Janssen (1934); James Craig Watson Medal (1929);
Authority file
	Q313059; ISNI: 0000000117596136; VIAF ID: 190428276; GND ID: 118935569; Library of Congress authority ID: n88100039; Bibliothèque nationale de France ID: 12370674m; IdRef ID: 083809414; Biografisch Portaal van Nederland ID: 31112756; NL CR AUT ID: kup20030000091271; Nationale Thesaurus voor Auteursnamen ID: 069983836; PLWABN ID: 9811301460505606; National Library of Israel J9U ID: 987007268246205171; SBN author ID: PUVV458944; Digitale Bibliotheek voor de Nederlandse Letteren author ID: sitt003; Mathematics Genealogy Project ID: 112159
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