1. Willem De Sitter Willem de Sitter (18721934). Dutch astronomer, mathematician, andphysicist, who contributed to the birth of modern cosmology. He http://astroinfo.port5.com/s/willem_de_sitter.html

Willem de Sitter 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. Site Map Category Main Page About Us

2. MSN Encarta - Search Results - Sitter Willem De Encarta Search results for sitter willem de . Page 1 of 1. De Klerk 7. Magazineand news articles about sitter willem de *. Encarta Magazine Center. http://encarta.msn.com/Sitter_Willem_de.html

MSN Home My MSN Hotmail Shopping ... Money Web Search: logoImg('http://sc.msn.com'); Encarta Subscriber Sign In Help Home ... Upgrade to Encarta Premium Search Encarta Encarta Search results for "Sitter Willem de" Page of 1 Exclusively for MSN Encarta Premium Subscribers Sitter, Willem de Article—Encarta Encyclopedia Sitter, Willem de (1872-1934), Dutch mathematician, physicist, and astronomer. De Sitter is best known for his studies of the structure of the... related items Einstein’s equations model of the universe relativity Willem de Kooning Article—Encarta Encyclopedia de Kooning, Willem (1904-1997), Dutch-born American painter, whose work is characterized by energetic brush strokes and twisted forms, and by an... Willem de Vlamingh Article—Encarta Encyclopedia Found in the Hartog, Dirk article Willem de Kooning Picture—Encarta Encyclopedia Picture from Encarta Encyclopedia Willem de Kooning Picture—Encarta Encyclopedia Picture from Encarta Encyclopedia De Klerk, Frederik Willem Article—Encarta Encyclopedia De Klerk, F(rederik) W(illem)

3. Sitter Willem de Sitter. Born Willem De Sitter studied mathematics at Groningenand then joined the Groningen astronomical laboratory. He http://www-gap.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 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

4. WIEM: Sitter Willem De sitter willem de (18721934), holenderski astronom, matematyk i kosmolog. Astronomia,Fizyka, Holandia sitter willem de (1872-1934). http://wiem.onet.pl/wiem/005a65.html

WIEM 2004 - zobacz now± edycjê encyklopedii! Kup abonament i encyklopediê na CD-ROM, sprawd¼ ofertê cenow±! Oferta specjalna abonamentów dla szkó³ i instytucji! Uwaga! Przedstawione poni¿ej has³o pochodzi z archiwalnej edycji WIEM 2001! Prace redakcyjne nad edycj± 2001 zosta³y zakoñczone. Zapraszamy do korzystania z nowej, codziennie aktualizowanej i wzbogacanej w nowe tre¶ci edycji WIEM 2004 Astronomia, Fizyka, Holandia Sitter Willem de Sitter Willem de (1872-1934), holenderski astronom, matematyk i kosmolog. Profesor uniwersytetu w Lejdzie (od 1908) i dyrektor tamtejszego Obserwatorium Astronomicznego (od 1918). Wiceprezes (1922-1925), a nastêpnie prezes (1925-1928) Miêdzynarodowej Unii Astronomicznej. Autor pionierskich prac wykorzystuj±cych ogóln± teoriê wzglêdno¶ci w  kosmologii WIEM zosta³a opracowana na podstawie Popularnej Encyklopedii Powszechnej Wydawnictwa Fogra zobacz wszystkie serwisy do góry

5. MSN Encarta - Résultats De La Recherche - De Sitter Willem Sitter Willem . Page 1 sur 1. Page1 sur 1. Résultats provenant de MSN Search. De sitter willem de Sitter Willem http://fr.encarta.msn.com/De_Sitter_Willem.html

Accueil MSN Mon MSN Hotmail Rechercher ... S'abonner   Encarta Premium Rechercher Encarta R©sultats de la recherche pour "De Sitter Willem" Page sur 1 R©serv© aux abonn©s MSN Encarta Premium. De Sitter, Willem Encyclop©die EncartaArticle De Sitter, Willem (1872-1934), math©maticien, physicien et astronome n©erlandais, principalement connu pour ses recherches sur la structure de l’... cosmologie Encyclop©die EncartaArticle Trouv© dans l'article cosmologie relativit© Encyclop©die EncartaArticle Trouv© dans l'article relativit© big bang, th©orie du Encyclop©die EncartaArticle Trouv© dans l'article big bang, th©orie du R©serv© aux abonn©s MSN Encarta Premium. Page sur 1 R©sultats provenant de MSN Search De Sitter Willem De Sitter Willem http://nabla1.chez.tiscali.fr/sitter.htm WILLEM DE SITTER WILLEM DE SITTER 1872-1934 Willem de Sitter est le fils d'un juge, pr©sident de la cour   Arnhem aux Pays-Bas. Il fait ses premi¨res ann©es d'©tudes dans cette ville. http://clubastronomie.free.fr/histoire/willem_de_sitter.htm La cr©ation de l'Univers - L'expansion de l'Univers La cosmologie, la cr©ation de l'Univers1

6. Willem De Sitter - Wikipedija Willem de Sitter. Iz Wikipedije, proste enciklopedije. http://sl.wikipedia.org/wiki/Willem_de_Sitter

Willem de Sitter Iz Wikipedije, proste enciklopedije. Willem de Sitter , nizozemski astronom in kozmolog 6. maj Sneek Frizija ... Leiden De Sitter je diplomiral na Univerzi v Gr¶ningnu , kjer je Å¡tudiral pri Kapteynu in tam tudi doktoriral. Na Gillovo povabilo je odÅ¡el na observatorij Rta dobre nade, kjer je delal od leta do . Od leta je bil profesor astronomije v Leidnu in od leta direktor observatorija v Leidnu. Proučeval je gibanje Jupitrovih satelitov in ukvarjal se je s problemi fotometrije . Å e posebej so pomembna njegova dela iz teoretične astronomije in relativnostne teorije. Bil je med prvimi, ki so se zanimali za Einsteinovo sploÅ¡no teorijo relativnosti . Leta je poslal Eddingtonu kopijo težke Einsteinove razprave o STR. Eddington je bil navduÅ¡en. V podrobnem uradnem poročilu je napisal: "Tudi če se bo nazadnje izkazalo, da teorija ni pravilna, terja naÅ¡o pozornost kot eden najlepÅ¡ih zgledov za prodornost sploÅ¡nega matematičnega razglabljanja." Einsteinovo delo je postalo znano v Angliji 29. maja sta angleÅ¡ki astronomski odpravi v Sobralu v Braziliji in na portugalskem Prinčevem otoku pred obalo tedanje Å panske Gvineje nesporno dokazali odklon svetlobnega curka v gravitacijskem polju telesa ob Sončevem popolnem mrku , kar je bil prvi dokaz STR. Zasnovala sta jo ob angleÅ¡ki vladni podpori prav Eddington in

7. Willem De Sitter Willem de Sitter. Highly respected Dutch astronomer. Willem de Sitter(18721934), a Dutch astronomer, mathematician and physicist http://spaceinfo.jaxa.jp/note/kagaku/e/kag115_desitter_e.html

Willem de Sitter Highly respected Dutch astronomer Willem de Sitter (1872-1934), a Dutch astronomer, mathematician and physicist, worked energetically across a wide number of fields, earning the respect of many theorists. De Sitter, who was interested in astronomy from his high school years, traveled to the royal observatory in Cape Town, South Africa, to study for his doctorate, which he received upon his return to the Netherlands in 1901. De Sitter became a professor of astronomy at Leiden University in 1908 and was appointed to head the university's observatory 11 years later. De Sitter's theory contributed to modern space theories When Albert Einstein published his special theory of relativity in 1905, few astronomers realized how much the idea would affect their field. In 1911, de Sitter published a simple theory based on the assumption that if Einstein's theory of relativity applied to astronomical bodies, all observations made according to Isaac Newton's theories would be drastically changed. After Einstein published his general theory of relativity in 1915, de Sitter responded with a series of papers, one of which included what became known as "de Sitter's Space," which stood in contrast to "Einstein's Space," a theory about space written by Einstein.

8. Willem De Sitter Willem de SITTER. 6.05.1872 19.11.1934 Holenderski astronom i matematyk.Studia ukonczyl na uniwersytecie w Groningen. Od roku http://kopernik.pl/index.php?id=1&kod=49

9. WILLEM DE SITTER - Meaning And Definition Of The Word Dictionary, Medical Dictionary. Search Dictionary WILLEM DE SITTER DictionaryEntry and Meaning. WordNet Dictionary. Definition n Dutch http://www.hyperdictionary.com/dictionary/Willem de Sitter

English Dictionary Computer Dictionary Thesaurus Dream Dictionary ... Medical Dictionary Search Dictionary: WILLEM DE SITTER: Dictionary Entry and Meaning WordNet Dictionary Definition: [n] Dutch astronomer who calculated ... expanding Synonyms: Sitter See Also: astronomer stargazer uranologist HOME ... ABOUT HYPERDICTIONARY

10. Portrait Of The Art World 1985) / Sitter Alice Neel Brook, John (born 1924) / Sitter Massachusetts PaintersBudnik, Dan (born 1933) / sitter willem de Kooning Burckhardt, Rudolph http://www.npg.si.edu/cexh/artnews/artist.htm

PORTRAIT OF THE ART WORLD A Century of ARTnews Photographs Artist Index A Abbott, Bernice (1898-1981) / Sitter: Edward Hopper Auerbach, Julia (born 1933) / Sitter: Lucian Freud Avedon, Richard (born 1923) / Sitter: Self-portrait B Beals, Jessie Tarbox (1870-1942) / Sitter: George W. Maynard Beaton, Cecil (1904–1980) / Sitter: Gertrude Stein Bellamy, Peter (born 1954) / Sitter: Hanne Tierney Ben-Yusuf, Zaida (active 1896-1915) / Sitter: Daniel Chester French Ben-Yusuf, Zaida (active 1896-1915) / Sitter: Everett Shinn Boughton, Alice (1865-1943) / Sitter: Albert Pinkham Ryder Breitenbach, Josef (1896–1984) / Sitter: Lyonel Feininger Brody, Sam (1907-1985) / Sitter: Alice Neel Brook, John (born 1924) / Sitter: Massachusetts Painters Budnik, Dan (born 1933) / Sitter: Willem de Kooning Burckhardt, Rudolph (1914–1999) / Sitter: Elaine de Kooning Burckhardt, Rudolph (1914–1999) / Sitter: Paul Georges Burckhardt, Rudolph (1914–1999) / Sitter: C. T. Loo Burckhardt, Rudolph

11. Artist Index 1985) / Sitter Alice Neel Brook, John , (born 1924) / Sitter Massachusetts PaintersBudnik, Dan , (born 1933) / sitter willem de Kooning Burckhardt, Rudolph http://www.npg.si.edu/cexh/artnews/artist2.htm

ARTIST INDEX A Abbott, Bernice , (1898-1981) / Sitter: Edward Hopper Auerbach, Julia , (born 1933) / Sitter: Lucien Freud Avedon, Richard , (born 1923) / Sitter: Richard Avedon B Beals, Jessie Tarbox , (1870-1942) / Sitter: George W. Maynard Beaton, Cecil , (1904–1980) / Sitter: Gertrude Stein Bellamy, Peter , (born 1944) / Sitter: Hanne Tierney Ben-Yusuf, Zaida , (active 1896-1915) / Sitter: Daniel Chester French Ben-Yusuf, Zaida , (active 1896-1915) / Sitter: Everett Shinn Boughton, Alice , (1865-1943) / Sitter: Albert Pinkham Ryder Breitenbach, Josef , (1896–1984) / Sitter: Lyonel Feininger Brody, Sam , (1907-1985) / Sitter: Alice Neel Brook, John , (born 1924) / Sitter: Massachusetts Painters Budnik, Dan , (born 1933) / Sitter: Willem de Kooning Burckhardt, Rudolph , (1914–1999) / Sitter: Elaine de Kooning Burckhardt, Rudolph , (1914–1999) / Sitter: Paul Georges Burckhardt, Rudolph , (1914–1999) / Sitter: Jack Tworkov Burckhardt, Rudolph , (1914–1999) / Sitter: C. T. Loo Burri, René

12. Willem De Sitter Encyclopedia. Main Page See live article, Willem de Sitter. Willem de Sitter (May6 1872 – November 20 1934) was a mathematician, physicist and astronomer. http://www.sciencedaily.com/encyclopedia/willem_de_sitter

Match: sort by: relevance date Free Services Subscribe by email RSS newsfeeds PDA-friendly format loc="/images/" A A A Find Jobs In: Healthcare Engineering Accounting College Contract / Freelance Customer Service Diversity Engineering Executive Healthcare Hospitality Human Resources Information Tech International Manufacturing Nonprofit Retail All Jobs by Job Type All Jobs by Industry Relocating? Visit: Moving Resources Moving Companies Mortgage Information Mortgage Calculator Real Estate Lookup Front Page Today's Digest Week in Review Email Updates ... Outdoor Living Encyclopedia Main Page See live article Willem de Sitter Willem de Sitter May 6 November 20 ) was a mathematician, physicist and astronomer. He was born in the city of Sneek in the Netherlands . De Sitter contributed to our concept of the universe. One of his accomplishments was to have co-authored a paper with Albert Einstein in in which they argued that there might be large amounts of matter which does not emit light, now commonly referred to as dark matter . He won the James Craig Watson Medal in and the Bruce Medal in , as well as the gold medal of the Royal Astronomical Society in that same year.

13. Sitter Biography of willem de sitter (18721934) willem de sitter. Born 6 May 1872 in Sneek, Netherlands willem de sitter studied mathematics at Groningen and then joined the Groningen astronomical 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 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

14. The Bruce Medalists: Willem De Sitter biographies and portraits of prizewinning astronomers of the 19th and 20th centuries 1985 Thomas G. Cowling. 1931 willem de sitter. 1921 Henri A willem de sitter studied at the University of 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.

15. Willem De Sitter Bibliography willem de sitter Bibliography. Papers, etc. de sitters papers are at the Leiden Observatory. There is much correspondence with de sitter in the Albert Einstein papers. Other References Historical . 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 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

16. Sitter, Willem De encyclopediaEncyclopedia sitter, willem de, vil um du sit ur PronunciationKey. sitter, willem de , 1872–1934, Dutch astronomer and mathematician. http://www.infoplease.com/ce5/CE048062.html

HOTWORDS CITE PRINT EMAIL in All Infoplease Almanacs Biographies Dictionary Encyclopedia Home Almanacs Atlas Dictionary ... D-Day Infoplease Tools Periodic Table Conversion Tool Perpetual Calendar Year by Year ... Site Map Also from Infoplease Search Infoplease Info search tips Search Biographies Bio search tips Encyclopedia Sitter, Willem de u m d u u r] Pronunciation Key Sitter, Willem de Kosmos (1932) and The Astronomical Aspect of the Theory of Relativity The Columbia Electronic Encyclopedia, Sitka National Historical Park Sittingbourne Related content from HighBeam Research on: Willem de Sitter Was there a Big Bang?(cosmology) (Commentary) Hubble, Edwin Powell (1889-1953) (The Hutchinson Dictionary of Scientific Biography) Hertzsprung, Ejnar (1873-1967) (The Hutchinson Dictionary of Scientific Biography) This is Britain's answer to Einstein but have you heard of him? Tomorrow is the centenary of the birth of one of our greatest and most neglected physicists. Graham Farmelo sheds light on the eccentric genius of Paul Dirac.(Features) (Daily Telegraph (London, England)) The will to disbelieve (Jerusalem Post) the CENTURY in SCIENCE.

17. De Sitter, Willem encyclopediaEncyclopedia de sitter, willem de sitter, willem see sitter,willem de. Related content from HighBeam Research on willem de sitter. http://www.infoplease.com/ce6/people/A0912498.html

HOTWORDS CITE PRINT EMAIL in All Infoplease Almanacs Biographies Dictionary Encyclopedia Home Almanacs Atlas Dictionary ... D-Day Infoplease Tools Periodic Table Conversion Tool Perpetual Calendar Year by Year ... Site Map Also from Infoplease Search Infoplease Info search tips Search Biographies Bio search tips Encyclopedia De Sitter, Willem: De Sitter, Willem: see Sitter, Willem de The Columbia Electronic Encyclopedia, design desktop publishing Related content from HighBeam Research on: Willem De Sitter Was there a Big Bang?(cosmology) (Commentary) Hubble, Edwin Powell (1889-1953) (The Hutchinson Dictionary of Scientific Biography) Hertzsprung, Ejnar (1873-1967) (The Hutchinson Dictionary of Scientific Biography) This is Britain's answer to Einstein but have you heard of him? Tomorrow is the centenary of the birth of one of our greatest and most neglected physicists. Graham Farmelo sheds light on the eccentric genius of Paul Dirac.(Features) (Daily Telegraph (London, England)) The will to disbelieve (Jerusalem Post) the CENTURY in SCIENCE. (Discover) ROBERT MOTHERWELL ONE OF THE MOST INTELLECTUAL ABSTRACT EXPRESSIONISTS, AND THE HARDEST TO UNDERSTAND.(DAILY BREAK)

18. MSN Encarta - Sitter, Willem De sitter, willem de. sitter, willem de ( 18721934), Dutch mathematician, physicist, and astronomer. de sitter is best known Find more about sitter, willem defrom. Related Items http://encarta.msn.com/encyclopedia_761589221/Willem_de_Sitter.html

MSN Home My MSN Hotmail Shopping ... Money Web Search: logoImg('http://sc.msn.com'); Encarta Subscriber Sign In Help Home ... Upgrade to Encarta Premium Search Encarta Subscription Article MSN Encarta Premium: Get this article, plus 60,000 other articles, an interactive atlas, dictionaries, thesaurus, articles from 100 leading magazines, homework tools, daily math help and more for $4.95/month or $29.95/year (plus applicable taxes.) Learn more. This article is exclusively available for MSN Encarta Premium Subscribers. Already a subscriber? Sign in above. Sitter, Willem de Sitter, Willem de (1872-1934), Dutch mathematician, physicist, and astronomer. De Sitter is best known for his studies of the structure of the... Related Items Einstein’s equations model of the universe 3 items Want more Encarta? Become a subscriber today and gain access to: Daily Math Help Literature Guides Researcher Tools Paper-Writing Guides 60,000 + articles Interactive Atlas Magazine Center Find more about Sitter, Willem de from Related Items Other Features from Encarta Cosmology Big Bang Theory Relativity Search Encarta for ... Sitter, Willem de

19. Sitter, Willem De sitter, willem de vil'um du sit'ur Pronunciation Key. sitter, willem de , 18721934, Dutch astronomer and mathematician. He was professor from 1908 at the Univ. of Leiden and in 1919 became director of its observatory. http://www.factmonster.com/cgi-bin/id/A0845418.hmtl

Encyclopedia Sitter, Willem de u m d u u r] Pronunciation Key Sitter, Willem de Kosmos (1932) and The Astronomical Aspect of the Theory of Relativity The Columbia Electronic Encyclopedia, Sitka National Historical Park Sittingbourne Print this page Cite this page AD AD AD ADS Link to Fact Monster Add Fact Monster search to your site ... Privacy Brought to you by:

20. Willem De Sitter --  Encyclopædia Britannica sitter, willem de Encyclopædia Britannica Article. willem de sitter. born May 6,1872, Sneek, Neth. MLA style willem de sitter. Encyclopædia Britannica. http://www.britannica.com/eb/article?eu=69785

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