willem de sitter

de Sitter

[duh sit-er]
Willem [wil-uhm] , Sitter, Willem de.
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Willem de [wil-uhm duh] , 1872–1934, Dutch astronomer and mathematician.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sitter (ˈsɪtə)
1.  a person or animal that sits
2.  a person who is posing for his or her portrait to be painted, carved, etc
3.  a broody hen or other bird that is sitting on its eggs to hatch them
4.  (in combination) a person who looks after a specified person or thing for someone else: flat-sitter
5.  short for baby-sitter
6.  anyone, other than the medium, taking part in a seance
7.  anything that is extremely easy, such as an easy catch in cricket

Sitter (ˈsɪtə)
Willem de (ˈwɪləm də). 1872--1934, Dutch astronomer, who calculated the size of the universe and conceived of it as expanding

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica

willem de sitter

Dutch mathematician, astronomer, and cosmologist who developed theoretical models of the universe based on Albert Einstein's general theory of relativity.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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