21. Sitter Biography of willem de sitter (18721934) willem de sitter studied mathematicsat Groningen and then joined the Groningen astronomical laboratory. http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Sitter.html

Willem de Sitter Born: 6 May 1872 in Sneek, Netherlands Died: 20 Nov 1934 in Leiden, Netherlands Click the picture above to see three larger pictures Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Version for printing Willem De Sitter studied mathematics at Groningen and then joined the Groningen astronomical laboratory. He worked at the Cape Observatory in South Africa (1897-99) then, in 1908, de Sitter was appointed to the chair of astronomy at Leiden. From 1919 he was director of the Leiden Observatory. In 1913 de Sitter produced an argument based on observations of double star systems which proved that the velocity of light was independent of the velocity of the source. It put to rest attempts which had been made up until this time to find emission theories of light which depended on the velocity of the source but were not in conflict with experimental evidence. De Sitter corresponded with Ehrenfest in 1916, and he proposed that a four- dimensional space- time would fit in with cosmological models based on general relativity. He published a series of papers (1916-17) on the astronomical consequences of Einstein 's general theory of relativity. He found solutions to

22. The Bruce Medalists: Willem De Sitter biographies and portraits of prizewinning astronomers of the 19th and 20th centuries. http://www.phys-astro.sonoma.edu/BruceMedalists/deSitter/

The Bruce Medalists Photo courtesy Yerkes Observatory, University of Chicago Willem de Sitter 6 May 1872 1931 Bruce Medalist 19 November 1934 Willem de Sitter studied at the University of Groningen and spent most of his career at the University of Leiden , where he directed and expanded the astronomy program. He also observed briefly with David Gill at the Cape of Good Hope, and he later stationed a Leiden astronomer in South Africa. He worked extensively on the motions of the satellites of Jupiter, determining their masses and orbits from decades of observations. He redetermined the fundamental constants of astronomy and determined the variation of the rotation of the earth. He also performed statistical studies of the distribution and motions of stars, but today he is best known for his contributions to cosmology. His 1917 solution to Albert Einstein's field equations showed that a near-empty universe would expand. Later, he and Einstein found an expanding universe solution without space curvature. Presentation of Bruce medal Meyer, W.F.

23. Willem De Sitter Bibliography de sitter, willem, Short History of the Observatory of the University at Leiden, de sitter, willem, “Proposal for a New Method of determining the http://www.phys-astro.sonoma.edu/BruceMedalists/deSitter/deSitterRefs.html

Willem de Sitter Bibliography Papers, etc. Leiden Observatory . There is much correspondence with de Sitter in the Albert Einstein papers Other References: Historical Berger, A., ed., Louvainla-Neuve, Belgium, 10-13 October 1983 (D. Reidel Pub. Co., Sold and distributed in the U.S.A. and Canada by Kluwer Academic Publishers, 1984). Bertotti, B., et al, eds., Modern Cosmology in Retrospect (Cambridge Univ. Press, Cambridge, UK, 1990). de Sitter, Willem, Short History of the Observatory of the University at Leiden, 1633-1933 ed. by P. C. van der Kruit and K. van Berkel (Kluwer Academic Publishers, Dordrecht, 2000), p. 79 - 108 [ abstract Einstein and the History of General Relativity, Godart, Odon and M. Heller, (Pachart Pub. House, Tucson, c1985). Isis Human Implications of Scientific Advance , Eric Gray Forbes, ed., Proceedings of the 15th International Congress of the History of Science in Edinburgh 10-15 Aug 1977 (Edinburgh U.P., Edinburgh, 1978), p. 567-75. Human Implications of Scientific Advance , Eric Gray Forbes, ed., Proceedings of the 15th International Congress of the History of Science in Edinburgh 10-15 Aug 1977 (Edinburgh U.P., Edinburgh, 1978), p. 541-43. Nature Einstein and the History of General Relativity

24. Willem De Sitter sitter, willem de (The Columbia Encyclopedia, Sixth Edition) de sitter,willem (18721934) (The Hutchinson Dictionary of Scientific Biography) http://www.infoplease.com/ce6/people/A0845418.html

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25. De Sitter, Willem More on de sitter willem from Infoplease. willem de sitter sitter, willem de ,1872–1934, Dutch astronomer and mathematician. He was professor from 1908 http://www.infoplease.com/ce6/people/A0912498.html

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26. Sitter, Willem De --  Encyclopædia Britannica de sitter s model (from Cosmos) Encyclopædia BritannicaIt was also in 1917 that the Dutch astronomer willem de sitter recognized that he sitter, willem de Dutch mathematician, astronomer, and cosmologist who http://www.britannica.com/eb/article-9068024

Home Browse Newsletters Store ... Subscribe Already a member? Log in Content Related to this Topic This Article's Table of Contents Willem de Sitter Print this Table of Contents Shopping Price: USD $1495 Revised, updated, and still unrivaled. The Official Scrabble Players Dictionary (Hardcover) Price: USD $15.95 The Scrabble player's bible on sale! Save 30%. Merriam-Webster's Collegiate Dictionary Price: USD $19.95 Save big on America's best-selling dictionary. Discounted 38%! More Britannica products Sitter, Willem de  Encyclopædia Britannica Article Page 1 of 1 Willem de Sitter born May 6, 1872, Sneek, Neth. died Nov. 20, 1934, Leiden Dutch mathematician, astronomer, and cosmologist who developed theoretical models of the universe based on Albert Einstein's general theory of relativity. Sitter, Willem de... (75 of 279 words) var mm = [["Jan.","January"],["Feb.","February"],["Mar.","March"],["Apr.","April"],["May","May"],["June","June"],["July","July"],["Aug.","August"],["Sept.","September"],["Oct.","October"],["Nov.","November"],["Dec.","December"]]; To cite this page: MLA style: "Sitter, Willem de."

27. Sitter: Definition And Much More From Answers.com de sitter space sitter, willem de (Dutch astronomer). fence sitter house sitter bedsitter recliner de sitter universe de sitter (crater) http://www.answers.com/topic/sitter

showHide_TellMeAbout2('false'); Business Entertainment Games Health ... More... On this page: Dictionary WordNet Translations Mentioned In Or search: - The Web - Images - News - Blogs - Shopping sitter Dictionary sit·ter sÄ­t ər n. One that sits, especially: A person who cares for young children when the parents are not home; a babysitter. A person who poses or models, as for a portrait. A brooding hen. WordNet Note: click on a word meaning below to see its connections and related words. The noun sitter has 4 meanings: Meaning #1 an organism (person or animal) that sits Antonym: stander (meaning #1) Meaning #2 a person engaged to care for children when the parents are not home Synonyms: babysitter baby-sitter Meaning #3 a person who poses for a painter or sculptor Synonym: artist's model Meaning #4 a domestic hen ready to brood Synonyms: brood hen broody broody hen setting hen ... Translations Translations for: Sitter Nederlands (Dutch) oppas, model Fran§ais (French) mod¨le, baby-sitter Deutsch (German) n. - Modell, Babysitter, br¼tender Vogel

28. De Sitter, Willem (1872-1934) -- From Eric Weisstein's World Of Scientific Biogr de sitter, willem (18721934) and assumed that the matter density was zero.This model is now called the Einstein-de sitter cosmological model. http://scienceworld.wolfram.com/biography/deSitter.html

Branch of Science Astronomers Branch of Science Physicists ... Dutch de Sitter, Willem (1872-1934) Dutch astronomer who developed a cosmological model in 1917 based on the assumptions of homogeneity and isotropy, the two assumptions of Einstein's model. His model assumed an expanding universe (in agreement with the Hubble law ), unlike Einstein's static model, and assumed that the matter density was zero. This model is now called the Einstein-de Sitter cosmological model Einstein Hubble Additional biographies: Bruce Medalists Bonn

29. Willem De Sitter [Pictures And Photos Of] willem de sitter pictures, photos, photographs, images, physics history. http://www.aip.org/history/esva/catalog/esva/de Sitter_Willem.html

A larger image of any photo may be purchased. Click on an image to place an order. For more information visit our home page Arthur Stanley Eddington, Paul Ehrenfest, Albert Einstein, Hendrik Antoon Lorentz, Willem de Sitter Description Front row: Eddington and Lorentz; back row: Einstein, Ehrenfest and Sitter; Leiden ; suit Item ID Einstein D13 Henry Norris Russell, Harlow Shapley, Willem de Sitter Description suit; sitting; outdoors; table; ocean; Russell with others, relaxing on the deck of a ship. L-R Russell, unknown person, Shapley, Sitter Item ID Russell Henry Norris D2 Willem de Sitter Description old age, profile, beard, standing, blackboard Item ID Sitter Willem de B1

30. AIP Niels Bohr Library sitter, willem de. Subjects. Cosmology. Astronomy History. Browse Catalog.by author. sitter, willem de. by title. Kosmos a course of MARC Display http://www.aip.org/history/catalog/14352.html

If you are not immediately redirected, please click here My List - Help Browse Books Archival Resources Archival Finding Aids Photos Browse FAQs Past Searches History Home Search: Author Subject Title Journal/Newspaper Title Series Computer File (Software) Title Video Title Refine Search AIP Niels Bohr Library Item Information Holdings More by this author Sitter, Willem de. Subjects Cosmology. Astronomy History. Browse Catalog by author: Sitter, Willem de. by title: Kosmos : a course of... MARC Display Kosmos : a course of six lectures on the development of our insight into the structure of the universe, delivered for the Lowell institute in Boston, in November 1931 / by W. de Sitter. by Sitter, Willem de. Cambridge, MA : Harvard university press, 1932. 1932. Call Number: KF SIT (bb) z Description: xii, 138 p. : XII plates (incl. ill., port) ; 23 cm. Added Author: Lowell institute lectures, 1931. Copy/Holding information Location Collection Call No. Status Niels Bohr Library Books General Collection KF SIT (bb) In NBL Format: HTML Plain text Delimited Subject: Email to: Horizon Information Portal 3.0

31. Willem De Sitter sitter, willem de, vil um du sit ur Pronunciation Key. sitter, willem de ,1872–1934, Dutch astronomer and mathematician. He was professor from 1908 at http://www.factmonster.com/ce6/people/A0845418.html

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32. De Sitter, Willem More on de sitter willem from Fact Monster. willem de sitter sitter, willemde , 1872–1934, Dutch astronomer and mathematician. http://www.factmonster.com/ce6/people/A0912498.html

Home U.S. People Word Wise ... Homework Center Fact Monster Favorites 2006 TFK Almanac Quiz: Charlie and the Chocolate Factory SpongeBob Lemony Snicket ... Fantasy Books Reference Desk Atlas Almanacs Dictionary Encyclopedia ... Encyclopedia De Sitter, Willem: De Sitter, Willem: see Sitter, Willem de The Columbia Electronic Encyclopedia, Page Tools: Cite Print More on De Sitter Willem from Fact Monster: Willem de Sitter Encyclopedia: Astronomy: Biographies - Encyclopeadia articles concerning Astronomy: Biographies. See more Encyclopedia articles on: Astronomy: Biographies AD AD AD ADS Business Cards Link to Fact Monster Add Fact Monster search ... Privacy Brought to you by: Information Please

33. De Sitter, Willem. The Columbia Encyclopedia, Sixth Edition. 2001-05 de sitter, willem. The Columbia Encyclopedia, Sixth Edition. 200105. http://www.bartleby.com/65/x-/X-DeSitter.html

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34. Sitter, Willem De. The Columbia Encyclopedia, Sixth Edition. 2001-05 sitter, willem de. The Columbia Encyclopedia, Sixth Edition. 200105. http://www.bartleby.com/65/si/Sitter-W.html

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36. AllRefer.com - Willem De Sitter (Astronomy, Biography) - Encyclopedia AllRefer.com reference and encyclopedia resource provides complete informationon willem de sitter, Astronomy, Biographies. Includes related research links. http://reference.allrefer.com/encyclopedia/X/X-DeSitter.html

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38. Sitter, Willem De sitter, willem de (18721934) de sitter was born in Sneek, Friesland, andstudied at the University of Groningen and the Royal Observatory, Cape Town, http://www.cartage.org.lb/en/themes/Biographies/MainBiographies/S/Sitter/1.html

Sitter, Willem de Dutch astronomer, mathematician, and physicist, who contributed to the birth of modern cosmology. He was influential in English-speaking countries in bringing the relevance of the general theory of relativity to the attention of astronomers. De Sitter was born in Sneek, Friesland, and studied at the University of Groningen and the Royal Observatory, Cape Town, South Africa. He was professor of theoretical astronomy at the University of Leiden from 1908 as well as director of its observatory from 1919. In 1911 de Sitter outlined how the motion of the constituent bodies of our Solar System might be expected to deviate from predictions based on Newtonian dynamics if Albert Einstein 's special relativity theory were valid. After the publication of Einstein's general theory of relativity 1915, de Sitter expanded his ideas and introduced the 'de Sitter universe' (as distinct from the 'Einstein universe'). His model later formed an element in the theoretical basis for the steady-state hypothesis regarding the creation of the universe. He presented further models of a nonstatic universe: he described both an expanding universe and an oscillating one.

39. Encyclopedia Of Astronomy And Astrophysics » De Sitter, Willem (1872–1934) de sitter, willem (1872–1934). DOI 10.1888/0333750888/4008; Published November 2000.Icon Full text (PDF, 22K). Article summary http://eaa.iop.org/index.cfm?action=summary&doc=eaa/4008@eaa-xml

40. Encyclopedia Of Astronomy And Astrophysics » Browse By Subject Article de sitter, willem (1872–1934); Published November 2000; SummaryCosmologist, born in Sneek, Netherlands, and started a rather traditional career http://eaa.iop.org/index.cfm?action=browse.home&type=cl&dir=History and Archaeoa

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