21. Snell, Willebrord. The Columbia Encyclopedia, Sixth Edition. 2001-05 snell, willebrord. The Columbia Encyclopedia, Sixth Edition. 200105. http://www.bartleby.com/65/sn/Snell.html

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22. Snellius, Willebrord. The Columbia Encyclopedia, Sixth Edition. 2001-05 snellius, willebrord. The Columbia Encyclopedia, Sixth Edition. 200105. see snell, willebrord. The Columbia Encyclopedia, Sixth Edition. http://www.bartleby.com/65/x-/X-Snellius.html

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23. Willebrord Snell snell, willebrord van Roijen (15801626) (The Hutchinson Dictionary of ScientificBiography). snell, willebrord (The Columbia Encyclopedia, Sixth Edition) http://www.infoplease.com/ce6/people/A0845695.html

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24. Snellius, Willebrord More on willebrord snellius from Infoplease. willebrord snell snell or snellius,willebrord , 1591–1626, Dutch mathematician. He is generally credited http://www.infoplease.com/ce6/people/A0918861.html

var zflag_nid="162"; var zflag_cid="57/1"; var zflag_sid="53"; var zflag_width="728"; var zflag_height="90"; var zflag_sz="14"; in All Infoplease Almanacs Biographies Dictionary Encyclopedia Daily Almanac for Sep 7, 2005 Skip Navigation Home Almanacs ... Word of the Day Editor's Favorites Back to School Hurricanes Daylight Saving Time Energy Consumption ... Mississippi Infoplease Tools Periodic Table Conversion Tool Perpetual Calendar Year by Year ... Site Map College Center Scholarship Search College Resources Career Center Job Search Post Your Resume Continuing Ed. more . . . Search: Infoplease Info search tips Search: Biographies Bio search tips google_ad_client = 'pub-1894504138907931'; google_ad_width = 120; google_ad_height = 240; google_ad_format = '120x240_as'; google_ad_type = 'text'; google_ad_channel =''; google_color_border = ['336699','B4D0DC','DFF2FD','B0E0E6']; google_color_bg = ['FFFFFF','ECF8FF','DFF2FD','FFFFFF']; google_color_link = ['0000FF','0000CC','0000CC','000000']; google_color_url = ['008000','008000','008000','336699']; google_color_text = ['000000','6F6F6F','000000','333333']; Encyclopedia Snellius, Willebrord:

25. Snell, Willebrord snell, willebrord (15811626) snell was born in Leiden, where he studied andeventually became professor. snell developed the method of triangulation in http://www.cartage.org.lb/en/themes/Biographies/MainBiographies/S/snell_1/1.html

Snell, Willebrord Dutch mathematician and physicist who devised the basic law of refraction, known as Snell's law, in 1621. He also founded the method of determining distances by triangulation. Snell was born in Leiden, where he studied and eventually became professor. Snell developed the method of triangulation in 1615, starting with his house and the spires of nearby churches as reference points. He used a large quadrant over 2 m/7 ft long to determine angles, and by building up a network of triangles, was able to obtain a value for the distance between two towns on the same meridian. From this, Snell made an accurate determination of the radius of the Earth. The laws describing the reflection of light were well known in antiquity, but the principles governing the refraction of light were little understood. Snell's law was published by French mathematician Descartes in 1637. He expressed the law differently from Snell, but could easily have derived it from Snell's original formulation. Whether Descartes knew of Snell's work or discovered the law independently is not known.

26. Willebrord Van Roijen Snell (1591 - 1626) Translate this page Recursos para que os estudantes possam entender os conceitos de física, e recursospara que os professores de física possam preparar suas aulas. http://paginas.terra.com.br/educacao/fisicavirtual/grandes/snell.htm

Willebrord van Roijen Snell Willebrord van Roijen Snell nasceu em 1580 na cidade de Leyden, Países Baixos, e faleceu na mesma cidade em 30 outubro 1626. Estudou Direito na universidade Leyden. Porém, se interessava muito por matemática; vindo a ensinar essa disciplina mesmo enquanto foi estudante de leis. Em 1600 viajou a vários países europeus, principalmente discutindo astronomia. Em 1602 foi a Paris onde continuou seus estudos. Recebeu seu diploma em Leyden em 1607. (Cidade de Leiden em 1626) Snell era filho de um professor de Matemática da Universidade de Leiden. Em 1613, sucedeu o pai nessa função. Em 1617 Snell publicou Eratosthenes Batavus , no qual propõe seu método de triangulação para medir a terra; fundando assim a Geodesia. Esse método é utilizado até hoje para executar mapeamentos topográficos. (É a base, inclusive, para os efetuados com auxílio de satélites). Snell melhorou também o método clássico para calcular os valores aproximados de pi por meio de polígonos. (Observatório da Universidade de Leiden, 1633)

27. Willebrord Van Roijen Snell Translate this page willebrord Van Roijen snell foi um matemático holandês, que nasceu em 1591 emorreu em 1626. Era filho de um professor de Matemática da Universidade de http://paginas.terra.com.br/educacao/calculu/Historia/snell.htm

Willebrord Van Roijen Snell N Bibliografia

28. BBC - History - Willebrord Van Roijen Snell (1580 - 1626) Described by Kepler as a credit to the geometry of our century , snell was amathematical prodigy whose early work on triangulation led to further http://www.bbc.co.uk/history/historic_figures/snell_willebrord_van_roijen.shtml

@import url('/includes/tbenh.css') ; Home TV Radio Talk ... A-Z Index WEDNESDAY 7th September 2005 Text only BBC Homepage History Homepage Topics Ancient Resources Interactive Content Reading Room Timelines Historic Figures ... History for Kids Practical History Archaeology Family History History Trails Community Messageboard Newsletter About This Site About the BBC ... Help Like this page? Send it to a friend! Willebrord van Roijen Snell (1580 - 1626) The son of a mathematician and linguist, Snell was originally intended to study law, but loved mathematics so much that by the age of eleven he was lecturing it at Leyden University alongside his law studies. In 1600 he travelled around Europe for two years before moving to Paris, once more to study law. However, on arrival back in Leyden in 1604 he decided to concentrate fully on mathematics. From 1610 he lectured on astronomy and mathematics for two years, becoming a full professor in 1615, upon which he decided to determine the meridian; the circumference of the earth. He established a network of cities forming triangles. A single measurement of a carefully selected baseline of just a few hundred metres enabled him to calculate the distances between all the towns via triangulation. He started with his house and local church towers as the triangulation points, eventually computing the distance between Alkmaar in the North and Bergen-op-Zoom in the South, a distance of 130km. As the use of astronomy had told him the latitude of these towns, he could calculate the distance between single lines of latitude, and therefore the circumference of the earth.

29. Snell, Willebrord snell, willebrord van Roijen. (15801626). Holandský fyzik a optik. Je objevitelemzákona lomu. Podrobne zkoumal krivku loxodromu. vylepšil metodu výpoctu http://www.aldebaran.cz/famous/people/Snell_Willebrord.html

Snell, Willebrord van Roijen Holandský fyzik a optik. Je objevitelem zákona lomu. Podrobnì zkoumal køivku loxodromu. vylepšil metodu výpoètu èísla pomocí polygonù a spoèítal ho na 7 platných cifer (v té dobì bylo známé na 2 platné cifry).

30. AllRefer.com - Willebrord Snell (Mathematics, Biography) - Encyclopedia AllRefer.com reference and encyclopedia resource provides complete informationon willebrord snell, Mathematics, Biographies. http://reference.allrefer.com/encyclopedia/S/Snell.html

AllRefer Channels :: Health Yellow Pages Reference Weather September 07, 2005 Medicine People Places History ... Maps Web AllRefer.com You are here : AllRefer.com Reference Encyclopedia Mathematics, Biographies ... Willebrord Snell By Alphabet : Encyclopedia A-Z S Willebrord Snell, Mathematics, Biographies Related Category: Mathematics, Biographies Willebrord Snell u brOrt snel, snel E u s] Pronunciation Key Eratosthenes Batavus (1617) and Cyclometricus Related Categories: People Science and Technology Science and Technology Mathematics ... Biographies More articles from AllRefer Reference on Willebrord Snell SITE MAPS Encyclopedia US Gazetteer: US States A-C US States D-H US States I-L US States M ... Countries A-Z Content on this web site is provided for informational purposes only. We accept no responsibility for any loss, injury or inconvenience sustained by any person resulting from information published on this site. We encourage you to verify any critical information with the relevant authorities. About Us Contact Us Privacy Links Directory ... Par Web Solutions Site best viewed in 800 x 600 resolution.

31. AllRefer.com - Willebrord Snellius (Mathematics, Biography) - Encyclopedia willebrord snellius see snell, willebrord. The Columbia Electronic EncyclopediaCopyright Topics that might be of interest to you. • willebrord snell http://reference.allrefer.com/encyclopedia/X/X-Snellius.html

AllRefer Channels :: Health Yellow Pages Reference Weather September 07, 2005 Medicine People Places History ... Maps Web AllRefer.com You are here : AllRefer.com Reference Encyclopedia Mathematics, Biographies ... Willebrord Snellius By Alphabet : Encyclopedia A-Z S Willebrord Snellius, Mathematics, Biographies Related Category: Mathematics, Biographies Willebrord Snellius see Snell, Willebrord Topics that might be of interest to you: Willebrord Snell Related Categories: People Science and Technology Science and Technology Mathematics ... Biographies More articles from AllRefer Reference on Willebrord Snellius SITE MAPS Encyclopedia US Gazetteer: US States A-C US States D-H US States I-L US States M ... Countries A-Z Content on this web site is provided for informational purposes only. We accept no responsibility for any loss, injury or inconvenience sustained by any person resulting from information published on this site. We encourage you to verify any critical information with the relevant authorities. About Us Contact Us Privacy Links Directory ... Par Web Solutions Site best viewed in 800 x 600 resolution.

32. Molecular Expressions: Science, Optics And You - Timeline - Willebrord Snell willebrord snell was an early seventeenth century Dutch mathematician who is bestknown for determining that transparent materials have different indices of http://micro.magnet.fsu.edu/optics/timeline/people/snell.html

Visit the Molecular Expressions Website Galleria Photo Gallery ... Home Willebrord Snell Willebrord Snell was an early seventeenth century Dutch mathematician who is best known for determining that transparent materials have different indices of refraction depending upon their composition. Snell was born to an affluent family in Leiden in 1580, and started studying mathematics as a very young man. His father was a scholar and professor of mathematics at the University of Leiden. Snell entered the University of Leiden at a relatively young age where he originally studied law. His attention soon turned to mathematics and he was teaching at the university by the time he was 20 years old. After finishing with his degree at the university, he traveled to eastern Europe and visited most of the major astronomers of the day. In 1613, Snell succeeded his father as professor of mathematics at Leiden and in 1617, he published Eratosthenes Batavus , which explained his methodology for measuring the Earth by triangulation. Snell had difficulty completing his work until the brother barons Sterrenberg took over and finished it with his assistance. This important work wove the foundations of modern geodesy. Snell also published other works, including his work on comets and in 1624, he published

33. MSN Encarta - Snell, Willebrord Translate this page snell, willebrord (Leida 1580–1626), scienziato olandese. Studiò diritto macoltivò l’interesse per la Trova altre informazioni su snell, willebrord http://it.encarta.msn.com/encyclopedia_1041506772/Snell_Willebrord.html

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34. Lexikon Willebrord Van Roijen Snell willebrord van Roijen snell aus der http://lexikon.freenet.de/Willebrord_Snell

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35. Willebrord Snell snell or snellius, willebrord , 1591–1626, Dutch mathematician. He is generallycredited with the discovery (1621) of the law of the refraction of light. http://www.factmonster.com/ce6/people/A0845695.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 Snell or Snellius, Willebrord u u s] Pronunciation Key Snell or Snellius, Willebrord , Dutch mathematician. He is generally credited with the discovery (1621) of the law of the refraction of light. In 1613 he became professor of mathematics at the Univ. of Leiden. His two chief works are Eratosthenes Batavus (1617) and Cyclometricus The Columbia Electronic Encyclopedia, Page Tools: Cite Print See more Encyclopedia articles on: Mathematics: Biographies AD AD AD ADS Business Cards Link to Fact Monster Add Fact Monster search ... Privacy Brought to you by: Information Please

36. Snellius, Willebrord More on willebrord snellius from Fact Monster. willebrord snell snell orsnellius, willebrord , 1591–1626, Dutch mathematician. He is generally credited http://www.factmonster.com/ce6/people/A0918861.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 Snellius, Willebrord: Snellius, Willebrord: see Snell, Willebrord The Columbia Electronic Encyclopedia, Page Tools: Cite Print More on Willebrord Snellius from Fact Monster: Willebrord Snell Encyclopedia: Mathematics: Biographies - Encyclopeadia articles concerning Mathematics: Biographies. See more Encyclopedia articles on: Mathematics: Biographies AD AD AD ADS Business Cards Link to Fact Monster Add Fact Monster search ... Privacy Brought to you by: Information Please

37. Snell | Willebrord | 1591-1626 | Dutch Mathematician snell willebrord 15911626 Dutch mathematician. Gregory Papers (1675-1713);David Gregory Papers (1675-1713); Excerpta et notanda in Kepleri ad http://www.nahste.ac.uk/pers/s/GB_0237_NAHSTE_P1104/

the project the collections biographies multimedia the project the collections biographies multimedia ... Index Chartarum in M.S. C. in folio

38. Encyclopædia Britannica Roijen snell, willebrord van (Du. astron. and math.) see snell, willebrord vanRoijen Roiphe, Anne (Am. feminist and au.) http://www.britannica.com/eb/index?seq=289864&alphakey=r&pageDir=n

39. Short Biographies : Si snell, willebrord van Roijen. 1580 30 Oct 1626 Dutch An astronomer andmathematician best known for his law of refraction of light. http://www.hallym.ac.kr/~physics/reference/physicist/Si.html

Snell , Willebrord van Roijen 1580 - 30 Oct 1626 Dutch An astronomer and mathematician best known for his law of refraction of light. In 1613 he succeeded his father Rudolph Snell (1546-1613) as professor of mathematics at the University of Leiden. He studied the loxodrome the path on the sphere that makes constant angle with the meridians. In 1617 he published Eratosthenes Batavus , which contains his methods for measuring the earth. He also improved the classical method of calculating approximate values of by polygons. Using his method 96 sided polygons give correct to 7 places while the classical method yields only 2 places. van Ceulen 's 35 places could be found with polygons of 2^30 sides rather than 2^62. Although he discovered the law of refraction, a basis of modern geometric optics, in 1621, he did not publish it and only in 1703 did it become known when Huygens published Snell's result in Dioptrica Origin Sommerfeld , Arnold Johannes Wilhelm 5 Dec 1868 - 26 Apr 1951 German He worked on wave mechanics and thermodynamics. He was taught by

40. Willebrord Snell - Wikipedia, The Free Encyclopedia willebrord snell. Enlarge. willebrord snell. willebrord snell (1580 – October30, 1626), also known as snell van Royen or snellius, was a Dutch astronomer http://en.wikipedia.org/wiki/Snellius

Wikimedia needs your help in the final days of its fund drive. See our fundraising page The Red Cross and other charities also need your help. Willebrord Snell From Wikipedia, the free encyclopedia. (Redirected from Snellius For the lunar crater named Snellius, see Snellius (crater). Willebrord Snell. Willebrord Snell October 30 ), also known as Snell van Royen or Snellius , was a Dutch astronomer and mathematician , most famous for the law of refraction now known as Snell's law Snell was born at Leiden . In he succeeded his father Rudolph Snell ( ) as professor of mathematics in the University of Leiden . In he planned and carried into practice a new method of finding the radius of the earth, by determining the distance of one point on its surface from the parallel of latitude of another, by means of triangulation . His work Eratosthenes Batavus ("The Dutch Eratosthenes "), published in , describes the method and gives as the result of his operations between Alkmaar and Bergen op Zoom —two towns separated by one degree of the meridian, which he measured to be equal to 117,449 yards (107.395 km ). The actual distance is approximately 111 km. Snell was also a distinguished mathematician, producing a new method for calculating

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