21. 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&tocid=0&query=almndega de peixe&ct

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23. MSN Encarta - Sitter, Willem De Sign in above. sitter, willem de. sitter, willem de (18721934), Dutch mathematician,physicist, and astronomer. Find more about sitter, willem de from, http://encarta.msn.com/encyclopedia_761589221/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 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

24. De Sitter, Willem (1872-1934) -- From Eric Weisstein's World Of Scientific Biogr Nationality. Dutch. de sitter, willem (18721934) This model is now called the Einstein-de sitter cosmological model http://www.treasure-troves.com/bios/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

25. Sitter, Willem De sitter, willem de (18721934). Dutch astronomer, mathematician, andphysicist, who contributed to the birth of modern cosmology. 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.

26. Sitter, Willem De. The Columbia Encyclopedia, Sixth Edition. 2001 2001. sitter, willem de. (v l´ md s t´ r) (KEY) , 1872–1934, Dutchastronomer and mathematician. He was professor from 1908 at the Univ. http://www.bartleby.com/65/si/Sitter-W.html

Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia Cultural Literacy World Factbook Columbia Gazetteer American Heritage Coll. Dictionary Roget's Thesauri Roget's II: Thesaurus Roget's Int'l Thesaurus Quotations Bartlett's Quotations Columbia Quotations Simpson's Quotations Respectfully Quoted English Usage Modern Usage American English Fowler's King's English Strunk's Style Mencken's Language Cambridge History The King James Bible Oxford Shakespeare Gray's Anatomy Farmer's Cookbook Post's Etiquette Bulfinch's Mythology Frazer's Golden Bough All Verse Anthologies Dickinson, E. Eliot, T.S. Frost, R. Hopkins, G.M. Keats, J. Lawrence, D.H. Masters, E.L. Sandburg, C. Sassoon, S. Whitman, W. Wordsworth, W. Yeats, W.B. All Nonfiction Harvard Classics American Essays Einstein's Relativity Grant, U.S. Roosevelt, T. Wells's History Presidential Inaugurals All Fiction Shelf of Fiction Ghost Stories Short Stories Shaw, G.B. Stein, G. Stevenson, R.L. Wells, H.G. Reference Columbia Encyclopedia PREVIOUS NEXT ... BIBLIOGRAPHIC RECORD The Columbia Encyclopedia, Sixth Edition. Sitter, Willem de

27. De Sitter, Willem. The Columbia Encyclopedia, Sixth Edition. 2001 2001. de sitter, willem. see sitter, willem de. The Columbia Encyclopedia,Sixth Edition. Copyright © 2003 Columbia University Press. http://www.bartleby.com/65/x-/X-DeSitter.html

Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia Cultural Literacy World Factbook Columbia Gazetteer American Heritage Coll. Dictionary Roget's Thesauri Roget's II: Thesaurus Roget's Int'l Thesaurus Quotations Bartlett's Quotations Columbia Quotations Simpson's Quotations Respectfully Quoted English Usage Modern Usage American English Fowler's King's English Strunk's Style Mencken's Language Cambridge History The King James Bible Oxford Shakespeare Gray's Anatomy Farmer's Cookbook Post's Etiquette Bulfinch's Mythology Frazer's Golden Bough All Verse Anthologies Dickinson, E. Eliot, T.S. Frost, R. Hopkins, G.M. Keats, J. Lawrence, D.H. Masters, E.L. Sandburg, C. Sassoon, S. Whitman, W. Wordsworth, W. Yeats, W.B. All Nonfiction Harvard Classics American Essays Einstein's Relativity Grant, U.S. Roosevelt, T. Wells's History Presidential Inaugurals All Fiction Shelf of Fiction Ghost Stories Short Stories Shaw, G.B. Stein, G. Stevenson, R.L. Wells, H.G. Reference Columbia Encyclopedia PREVIOUS NEXT ... BIBLIOGRAPHIC RECORD The Columbia Encyclopedia, Sixth Edition. De Sitter, Willem

28. De Sitter, Willem (1872-1934) -- From Eric Weisstein's World Of Scientific Biogr Alphabetical Index. About this site. Branch of Science , Astronomers v. Branchof Science , Physicists v. Nationality , Dutch v. de sitter, willem (18721934), 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. De Sitter Willem Translate this page de sitter , willem (1872-1934) Mathématicien, physicien et astronomenéerlandais. Ses travaux ont permis aux astronomes de se http://nabla1.chez.tiscali.fr/sitter.htm

De Sitter , Willem (1872-1934) Mathématicien, physicien et astronome néerlandais. Ses travaux ont permis aux astronomes de se familiariser avec la théorie de la relativité élaborée par Einstein

30. Fauth Translate this page willem de sitter (1872-1934),. zu Sneek in den Niederlanden geboren,wurde 1908 Professor für Astronomie an der Universität Leyden. http://home.t-online.de/home/m.holl/sitter.htm

Willem de Sitter (1872-1934), Erst durch Hubbles Entdeckung der Fluchtgeschwindigkeit der Galaxien gewannen de Sitters Theorien erneut an Bedeutung, da sie Hubble erst dazu anregten, den verschiedenen direkten Hinweisen zur Expansion des Weltalls nachzugehen. Weitere Arbeitsgebiete de Sitters waren die Theorie der Bewegung der Jupitermonde und die Schwankungen in der Rotationszeit der Erde.

31. Biografia De Sitter, Willem De Translate this page sitter, willem de. (Sneek, 1872-Leiden, 1934) Astrónomo neerlandés.En clara oposición a la concepción del universo estático http://www.biografiasyvidas.com/biografia/s/sitter.htm

Inicio Buscador Utilidades Recomendar sitio Enlaces Sitter, Willem de (Sneek, 1872-Leiden, 1934) Astrónomo neerlandés. En clara oposición a la concepción del universo estático, defendida inicialmente por Einstein, logró demostrar que el modelo de un universo isótropo y homogéneo puede conciliarse con la observación del corrimiento de las rayas del espectro. En 1932 estableció un modelo cosmológico en colaboración con A. Einstein. De 1925 a 1928 fue presidente de la Unión Astronómica Internacional. Inicio Buscador Recomendar sitio

32. S Index Simplicius (933) Simpson, Thomas (263*) Simson, Robert (1914*) Sina, ibn (Avicenna)(438*) Sinan ibn Thabit (719) Sintsov, Dmitrii (223*) sitter, willem de (483 http://www-gap.dcs.st-and.ac.uk/~history/Indexes/S.html

Names beginning with S The number of words in the biography is given in brackets. A * indicates that there is a portrait. Saccheri , Giovanni (212) Sacrobosco , Johannes de (328*) St-Venant Saint-Vincent , Gregorius (296*) Saks , Stanislaw (1132*) Salaciense , Pedro Nunes (332*) Salem Salmon , George (1351*) Samarqandi , Shams al (202) Samawal , Ibn al (1569) Samoilenko , Anatoly (252*) Sang , Edward (471*) Sankara , Narayana (724) Sargent , Winifred (1339) Sasaki , Shigeo (1066*) Saunderson , Nicholas (1869*) Saurin , Joseph (210) Savage , Leonard (299*) Savart , Felix (106) Savary Savasorda (A bar Hiyya) (641) Savile , Sir Henry (1130*) Schafer , Alice (1344*) Schatten , Robert (682) Schauder , Juliusz (1012*) , Henry (844*) Scheffers , Georg (143*) Schickard , Wilhelm (219*) , Ludwig (191*) , Oscar (49*) Schmidt , Erhard (1382*) Schoenberg , Isaac (816*) , Arthur (370*) Schooten , Frans van (259*) Schottky , Friedrich (251*) Schoute , Pieter (363) Schouten , Jan (341*) Schreier , Otto (582*) , Ernst (174*) , Erwin (2585*) Schroeter , Heinrich (182*) Schubert , Hermann (101*) Schur , Issai (1667*) Schwartz , Laurent (1119*) Schwarz, Herman

33. Âèëëåì äå Ñèòòåð (Willem De Sitter) The summary for this Russian page contains characters that cannot be correctly displayed in this language/character set. http://www.peoples.ru/science/astronomy/de_sitter/

a a b c ... z English German French Beartrap - Security Appliance SmartFunction.com - Dedicated Web Hosting SmartForex.com - Currency Trading (Forex) ÑÈÒÒÅÐ, ÂÈËËÅÌ ÄÅ (Sitter, Willem de) (1872–1934), íèäåðëàíäñêèé àñòðîíîì. Ðîäèëñÿ 6 ìàÿ 1872 â Ñíåêå. Îêîí÷èë ðîíèíãåíñêèé óíèâåðñèòåò, ðàáîòàë â àñòðîíîìè÷åñêîé ëàáîðàòîðèè. Ïîñëå äâóõ ëåò ðàáîòû ìàòåìàòèêîì-âû÷èñëèòåëåì íà îáñåðâàòîðèè ìûñà Äîáðîé Íàäåæäû (1897–1899) ñòàë àññèñòåíòîì Àñòðîíîìè÷åñêîé ëàáîðàòîðèè â ðîíèíãåíå, à â 1908 – ïðîôåññîðîì àñòðîíîìèè Ëåéäåíñêîãî óíèâåðñèòåòà. Ñ 1919 Ñèòòåð – äèðåêòîð Ëåéäåíñêîé îáñåðâàòîðèè. Àäðåñ (e-mail)(*): Îáðàòíûé àäðåñ (e-mail): X-WILD MagNet D'Art studio Web Hosting ... Forex Links

34. De Sitter, Willem de sitter, willem de sitter, willem see sitter, willem de. The Columbia ElectronicEncyclopedia, 6th ed. Copyright © 2003, Columbia University Press. http://www.factmonster.com/ce6/people/A0912498.html

Encyclopedia De Sitter, Willem: De Sitter, Willem: see Sitter, Willem de The Columbia Electronic Encyclopedia, design desktop publishing 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:

35. Einstein Archives Online - Contents Of Folder 20-8(b) Translate this page Get full record from archival database, 20-531.00, 06/22/1916, Einstein, Albert,sitter, willem de, Get publication information for item (The Collected Papers of http://www.alberteinstein.info/db/ViewFolder.do?folder=20-8(b)

36. Einstein Archives Online - Contents Of Folder 21-8 Translate this page Albert, Schlesinger, F, Get full record from archival database, 21-497.00,09/04/1933, Einstein, Albert, sitter, willem de, Get full record http://www.alberteinstein.info/db/ViewFolder.do?folder=21-8

37. WILLEM DE SITTER président de la cour à Arnhem aux Pays-Bas. Il fait ses http://clubastronomie.free.fr/histoire/willem_de_sitter.htm

WILLEM DE SITTER Willem de Sitter est le fils d'un juge, président de la cour à Arnhem aux Pays-Bas. Il fait ses premières années d'études dans cette ville. Il s'inscrit plus tard à l'Université de Groningen, en physique mathématique, où il prépare un doctorat. De 1897 à 1899, il travaille à l'Observatoire royal de Capetown, en Afrique du Sud, avec David Gill. Puis, il revient à Groningen où il travaille avec Kapteyn jusqu'en 1908. Cette années-là, il est nommé professeur à l'Université de Leiden et, de 1919 jusqu'à sa mort, il sera directeur de l'Observatoire de Leiden.

38. De Sitter sitter, willem de. (18721934). Nemecký astronom, který v roce 1917oznámil nový kosmologický model, založený na predpokladech http://www.aldebaran.cz/famous/people/Sitter_Willem_de.html

Sitter, Willem de Nìmecký astronom, který v roce 1917 oznámil nový kosmologický model, založený na pøedpokladech, že Vesmír je expandující podle Hubblova zákona (nikoli statický, jak pøedpokládaly Einsteinovy modely) a hustota hmoty byla v poèátcích nulová. Tento model se nazývá Einstein de Sitterùv kosmologický model.

39. Biografía De Willem De Sitter Translate this page willem de sitter, Nacido el 06 mayo Países Bajos. willem de sitter estudiómatemáticas y astronomía en Groningen. Paralelamente, entre http://www.astrocosmo.cl/biografi/b-w_sitter.htm

Willem de Sitter Nacido el 06 mayo de 1872 , en Sneek, Países Bajos, Fallecido el 20 noviembre de 1934, en Leiden, Países Bajos. Willem de Sitter estudió matemáticas y astronomía en Groningen. Paralelamente, entre los años 1897 y 1899, trabajo en el observatorio Cape Observatory en Sudáfrica. Tras doctorarse en 1908, fue nombrado profesor de astronomía de la Universidad de Leyden. A partir de 1919 fue director del observatorio de dicha universidad. De Sitter fue uno de los científicos de la época que contribuyó a popularizar la teoría de la relatividad, participando también activamente en la organización de la expedición de 1919, destinada a verificar experimentalmente una de la predicciones de dicha teoría durante el eclipse que tuvo lugar en este año. Cuando Albert Einstein publicó su teoría de la relatividad especial en 1905, pocos astrónomos se interesaron en realizar estudios sobre los posibles efectos que tendría esa teoría sobre la observación. En 1911, de Sitter publicó una teoría simple en la cual asumía la aplicación de la teoría de la relatividad especial de Einstein a los cuerpos astronómicos. En su trabajo, de Sitter concluyó que las estimaciones observacionales realizadas hasta la fecha bajo la teoría newtoniana quedaban obsoletas en función de la relatividad einstiana. En de 1913, de Sitter propugnó la observacionalmente comprobada idea de que la velocidad de la luz es independiente a la velocidad de la fuente. Hasta aquel entonces, la teoría sobre la emisión de luz señalaba que la velocidad de ésta dependía de la velocidad de movimiento de la fuente.

40. National Academy Of Sciences - Deceased Member de sitter, willem. Date of Birth May 6, 1872. Electedto NAS 1929. Date of death November 21, 1934. http://www4.nationalacademies.org/nas/nasdece.nsf/(urllinks)/NAS-58MVCN?opendocu

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