Willem de Sitter (May 6th, 1872 - November 20th, 1934) was a mathematician, physicist and astronomer Dutch. It was born in the town of Sneek with the Netherlands.

Biography

Willem de Sitter studied the Mathématiques with the Université of Groningue then integrated the laboratory of astronomy of Groningue. He worked at the observatory of the Cape in South Africa (1897 - 1899) then, in 1908, of Sitter was named with the pulpit of astronomy of the Université of Leyde. He was director of the Observatoire of Leyde of 1919 until his death.

Work

De Sitter contributed to improve comprehension of Cosmology. One of its important works is the Co-drafting of an article with Albert Einstein in 1932, in which they conjoncturaient that it was to have in the universe a great quantity of matter which did not emit a light, currently indicated like the Matière sinks.

De Sitter was also famous for its work on the planet Jupiter (planet).

Honorary distinctions

; Rewards

• Medal James Craig Watson (1929)
• Medal Bruce (1931)
• Gold medal of Royal Astronomical Society (1931)

; Éponymes

• the crater of Sitter on the the Moon
• the Asteroid (1686) De Sitter

See too

• Universe of Sitter (cosmology)
• Space of Sitter (mathematical)
• Horizon of Sitter

External bonds

• Page of the medal
• Attribution of the Bruce medal: PASP ''' 43 ''' (1931) 125
• Attribution of the gold medal of the SHORT-NAP CLOTH: MNRAS ''' 91 ''' (1931) 422

Obituaries

• YEAR ''' 253 ''' (1934) 495/496 (a line)
• JRASC ''' 29 ''' (1935) 1
• MNRAS ''' 95 ''' (1935) 343
• Obs ''' 58 ''' (1935) 22
• PASP ''' 46 ''' (1934) 368 (a paragraph)
• PASP ''' 47 ''' (1935) 65

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