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Willem de Sitter: Quick Facts

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Facts

Born May 6, 1872 • Sneek • Netherlands
Died November 20, 1934 (aged 62) • Leiden • Netherlands • (Anniversary in 7 days)
Subjects Of Study expanding universe
Christiaan Huygens
Christiaan Huygens
Dutch scientist and mathematician
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Willebrord Snell
Dutch astronomer and mathematician
Galileo
Galileo
Italian natural philosopher, astronomer, and mathematician
Giordano Bruno
Giordano Bruno
Italian philosopher
Engraving of six astronomers, with Hipparchus seated at center and, from left to right, Galileo, Johannes Hevelius, Tycho Brahe, Nicolaus Copernicus, and Ptolemy standing, each holding scientific instruments.
Hipparchus
Greek astronomer
Engraving portrait of Carl Friedrich Gauss wearing a cap and formal 19th-century clothing, with detailed shading around his face and upper body.
Carl Friedrich Gauss
German mathematician
Roger Bacon
Roger Bacon
English philosopher and educational reformer
How did Ptolemy explain retrograde motion?
Ptolemy
Egyptian astronomer, mathematician, and geographer
Edmond Halley
Edmond Halley
British scientist
Edwin Hubble
Edwin Hubble
American astronomer
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Sir William Rowan Hamilton
Irish mathematician and astronomer
Arthur Stanley Eddington.
Arthur Eddington
British scientist
Portrait of Pierre Simon Marquis de Laplace wearing formal attire with a sash and star-shaped medal, looking slightly to his left.
Pierre-Simon, marquis de Laplace
French scientist and mathematician
John Herschel
Sir John Herschel, 1st Baronet
English astronomer
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Eudoxus of Cnidus
Greek mathematician and astronomer
Simon Newcomb, c. 1905.
Simon Newcomb
American astronomer and mathematician
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Omar Khayyam
Persian poet and astronomer
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Ibn al-Haytham
Arab astronomer and mathematician
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al-Kāshī
Persian astronomer and mathematician
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Regiomontanus
German mathematician

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