1. Sitter Mathematician who studied solution to general relativity and developed DeSitter spaceCategory Science Physics Relativity People......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

2. WIEM: Sitter Willem De sitter willem de (18721934), holenderski astronom, matematyk i kosmolog. Profesor uniwersytetu w Lejdzie (od 1908) i dyrektor tamtejszego http://www.encyklopedia.pl/wiem/005a65.html

wiem.onet.pl napisz do nas losuj: has³a multimedia Astronomia, Fizyka, Holandia Sitter Willem de widok strony znajd¼ podobne poka¿ powi±zane 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 Zobacz równie¿ Wszech¶wiata modele Odwied¼ w Internecie Astronomia Powi±zania Kosmologia wiêcej zobacz wszystkie serwisy do góry Encyklopedia zosta³a opracowana na podstawie Popularnej Encyklopedii Powszechnej Wydawnictwa Fogra

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

wiem.onet.pl napisz do nas losuj: has³a multimedia Astronomia, Fizyka, Holandia Sitter Willem de widok strony znajd¼ podobne poka¿ powi±zane 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 Zobacz równie¿ Wszech¶wiata modele Odwied¼ w Internecie Astronomia Powi±zania Kosmologia wiêcej zobacz wszystkie serwisy do góry Encyklopedia zosta³a opracowana na podstawie Popularnej Encyklopedii Powszechnej Wydawnictwa Fogra

4. Willem De Sitter Willem de Sitter. Highly respected Dutch astronomer. Willem de Sitter(18721934), a Dutch astronomer, mathematician and physicist http://spaceboy.nasda.go.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.

5. More Astronomers Hale Percival Lowell Percival Lowell Percival Lowell Robert Goddard Robert GoddardMaria Mitchell Maria Mitchell Maria Mitchell Willem De sitter willem de http://www.k12.hi.us/~hickam/more_astronomers.html

More Astronomers Sir Arthur Eddington Arthur Eddington Arthur Eddington George Hale ... Back to Hickam Elementary's Bookmarks

6. Willem De Sitter - Acapedia - Free Knowledge, For All acapedia.org home acapedia feedback. Friends of Acapedia Willem de Sitter. FromWikipedia, the free encyclopedia. (There is currently no text in this page). http://acapedia.org/aca/Willem_de_Sitter

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7. 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

8. 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

9. Sitter Biography of willem de sitter (18721934) willem de sitter. Born 6 May 1872 in Sneek, Netherlands 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

10. Willem De Sitter Bibliography willem de sitter Bibliography. Papers, etc. de sitters papers are at the Leiden Observatory. 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

11. Sitter, Willem De. The Columbia Encyclopedia, Sixth Edition. 2001 sitter, willem de. (v l´ m d s t´ r) (KEY) , 18721934, Dutch astronomer and mathematician. http://www.bartleby.com/65/si/Sitter-W.html

Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia 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 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

12. Encyclopædia Britannica Encyclopædia Britannica. sitter, willem de. Encyclopædia Britannica Article http://www.britannica.com/eb/article?eu=69785

13. De Sitter Willem de sitter , willem (18721934) 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

14. 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 (545*) Samarqandi , Shams al (202) Samawal , Ibn al (1569) Samoilenko , Anatoly (252*) Sang , Edward (471*) Sankara , Narayana (724) Sargent , Winifred (1339) Sasaki , Shigeo (1066*) 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 (2527*) Schroeter , Heinrich (182*) Schubert , Hermann (101*) Schur , Issai (1667*) Schwartz , Laurent (637*) Schwarz, Herman

15. 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

The # 1 wireless color security cam! Ultimate home movie ! Genuine Indian and Asian astrology reports and consultations by reputed Vedic Astrologers. Step-by-step guide to finding money for a growing business All Infoplease All Almanacs General Entertainment Sports Biographies Dictionary Encyclopedia Infoplease Home Almanacs Atlas Dictionary ... Fact Monster Kids' reference Info:Daily Fun facts Homework Center Newsletter You've got info! Help Site Map Visit related sites from: Family Education Network Encyclopedia Sitter, Willem de u m d u u r] Pronunciation Key Sitter, Willem de , Dutch astronomer and mathematician. He was professor from 1908 at the Univ. of Leiden and in 1919 became director of its observatory. His early work on the motions of Jupiter and its satellites contributed to the downfall of the pre-Einstein celestial mechanics. Using Einstein's formulation of relativity, he theorized that space cannot be in a stable equilibrium, and he concluded that the universe is expanding. He suggested a dynamic universe in which there is motion but no matter, in contrast to Einstein's static universe containing matter but no motion. In the combined Einstein-de Sitter model, the universe is expanding at a decreasing rate that approaches zero. De Sitter's works in English include Kosmos (1932) and The Astronomical Aspect of the Theory of Relativity Sitka Sittingbourne Search Infoplease Info search tips Search Biographies Bio search tips About Us Contact Us Link to Infoplease ... Privacy

16. Scientists: Physical Sciences Carl Edward; Schiaparelli, Giovanni Virginio; Shklovsky, Iosif Samuilovich;sitter, willem de; Slipher, Vesto Melvin; Tombaugh, Clyde http://www.infoplease.com/spot/scibio6.html

The # 1 wireless color security cam! Ultimate home movie ! Genuine Indian and Asian astrology reports and consultations by reputed Vedic Astrologers. Step-by-step guide to finding money for a growing business All Infoplease All Almanacs General Entertainment Sports Biographies Dictionary Encyclopedia Infoplease Home Almanacs Atlas Dictionary ... Fact Monster Kids' reference Info:Daily Fun facts Homework Center Newsletter You've got info! Help Site Map Visit related sites from: Family Education Network Notable Scientists: Physical Sciences Astronomers, astrophysicists, chemists, and physicists Jump to a category: Astronomers Astrophysicists Chemists Physicists Astronomers RELATED LINKS Astronomy Astronomical Calendar Nobel Prize for Chemistry Nobel Prize for Physics ... Physical Science Search for more scientists and other notable figures Adams, John Couch Al-Battani Al-Farghani Amici, Giovanni Battista ... Ulugh-Beg Astrophysicists Abbot, Charles Greeley Chandrasekhar, Subrahmanyan Eddington, Sir Arthur Stanley Fowler, William Alfred ... Ride, Sally K. Chemists Abel, Sir Frederick Augustus

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

Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia 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 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

18. The Bruce Medalists: Willem De Sitter lacks the ability to read frames. Don't worry, you can still enjoythis site. willem de sitter, Bruce Medalist. The Bruce Medalists. http://www.phys-astro.sonoma.edu/BruceMedalists/deSitter/

If you are viewing this text, your browser lacks the ability to read frames. Don't worry, you can still enjoy this site. Willem de Sitter, Bruce Medalist The Bruce Medalists

19. Sitter, Willem De Pronunciation Key. sitter, willem de , 1872 1934 , Dutch astronomer and mathematician. http://www.factmonster.com/ce6/people/www.factmonster.com/ce6/people/A0845418.ht

Encyclopedia Sitter, Willem de u m d u u r] Pronunciation Key Sitter, Willem de , Dutch astronomer and mathematician. He was professor from 1908 at the Univ. of Leiden and in 1919 became director of its observatory. His early work on the motions of Jupiter and its satellites contributed to the downfall of the pre-Einstein celestial mechanics. Using Einstein's formulation of relativity, he theorized that space cannot be in a stable equilibrium, and he concluded that the universe is expanding. He suggested a dynamic universe in which there is motion but no matter, in contrast to Einstein's static universe containing matter but no motion. In the combined Einstein-de Sitter model, the universe is expanding at a decreasing rate that approaches zero. De Sitter's works in English include Kosmos (1932) and The Astronomical Aspect of the Theory of Relativity Sitka Sittingbourne AD AD AD AD AD Print this page Cite this page Awards and Press Link to Fact Monster Add Fact Monster search ... Privacy

20. De Sitter, Willem. The Columbia Encyclopedia, Sixth Edition. 2001 2001. de sitter, willem. see sitter, willem de. The Columbia Encyclopedia,Sixth Edition. Copyright © 2002 Columbia University Press. http://www.bartleby.com/65/x-/X-DeSitter.html

Select Search All Bartleby.com All Reference Columbia Encyclopedia World History Encyclopedia 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 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

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