21. Snell Biography of willebrord snell (15801626) willebrord van Roijen snell. Born 1580 in Leiden, Netherlands willebrord snell studied law at the University of Leiden but was very interested in mathematics and taught mathematics http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Snell.html

Willebrord van Roijen Snell Born: 1580 in Leiden, Netherlands Died: 30 Oct 1626 in Leiden, Netherlands Click the picture above to see two larger pictures Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Willebrord Snell studied law at the University of Leiden but was very interested in mathematics and taught mathematics even while he studied law. From about 1600 he travelled to various European countries, mostly discussing astronomy. In 1602 he went to Paris where his studies continued. He received his degree from Leiden in 1607. Snell's father, Rudolph Snell (1546-1613), was professor of mathematics at Leiden and, in 1604, Willebrord visited Switzerland with his father. In 1613 he succeeded his father as professor of mathematics at the University of Leiden. In 1617 Snell published Eratosthenes Batavus , which contains his methods for measuring the Earth. He proposed the method of triangulation and this work is the foundation of geodesy. Snell also improved the classical method of calculating approximate values of p by polygons. Using his method 96 sided polygons give

22. Smart Card To Soda Niter. Alphabetic Index To Entries. The Columbia Encyclopedia sneeze. sneeze gas. sneezeweed. Snefru. snell, George Davis. snell, willebrord. snelling,Fort. snellius, willebrord. snell’s law. snipe. Snodgrass, WD. Snøhetta. snook. http://www.bartleby.com/65/index222.html

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23. WILLEBRORD SNELL willebrord snell. snell, willebrord (15911626), commonly known as snellITJS, Dutch astronomer and he succeeded his father Rudolph snell (1546-1613) as professor of mathematics http://www.1911encyclopedia.org/S/SN/SNELL_WILLEBRORD.htm

WILLEBRORD SNELL SNELL, WILLEBRORD (1591-1626), commonly known as SNELLITJS, Dutch astronomer and mathematician, was born at Leiden in 1591. In 1613 he succeeded his father Rudolph Snell (1546-1613) as professor of mathematics in the university of Leiden. In 1615 he planned and carried into practice a new method of finding the dimensions of the earth, by determining the distance of one point on its surface from the parallel of another, by means of a triangulation. His work Eratosthenes Batavus, published in 1617, describes the method and gives as the result of his operations between Alkmaar and Bergen-opZoom a degree of the meridian equal to 55,100 toises= 117,449 yds. (A later recalculation gave 57,033 toises = 121,569 yds., after the application of some corrections to the measures indicated by himself.) Snell also distinguished himself as a mathematician, and discovered the law of refraction, in 1621 (see LIGHT). He died at Leiden on the 3oth of October 1626. In addition to the Eratosthenes Batavus he published Cycloinetria live de circuhi dimen none (1621), and Tiphys Batavus s. Histiodromice, de navium cursi bus ci re navali (1624). He also edited Coeli et s-iderum in eo errantium 011 servationes Hassiacae (1618), containing the astronomical observations of Landgrave William IV. of Hesse. A trigonometry (Doctrina triangulorum,) by him was published a year after his death. JOHN SNELL SNIPE

24. Snell, Willebrord snell, willebrord (15811626). Dutch mathematician and physicist whodevised the basic law of refraction, known as snell s law, in 1621. 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.

25. Willebrord Snell (1580-1626) willebrord snell (15801626) This is a biographical sketch of willebrord snell. snell was an early seventeenth century Dutch mathematician who is best known for determining that transparent http://rdre1.inktomi.com/click?u=http://micro.magnet.fsu.edu/optics/timeline/peo

26. WILLEBRORD SNELL snell, willebrord (15911626), commonly known as snellITJS, Dutch astronomerand mathematician, was born at Leiden in 1591. willebrord snell. http://85.1911encyclopedia.org/S/SN/SNELL_WILLEBRORD.htm

WILLEBRORD SNELL SNELL, WILLEBRORD (1591-1626), commonly known as SNELLITJS, Dutch astronomer and mathematician, was born at Leiden in 1591. In 1613 he succeeded his father Rudolph Snell (1546-1613) as professor of mathematics in the university of Leiden. In 1615 he planned and carried into practice a new method of finding the dimensions of the earth, by determining the distance of one point on its surface from the parallel of another, by means of a triangulation. His work Eratosthenes Batavus, published in 1617, describes the method and gives as the result of his operations between Alkmaar and Bergen-opZoom a degree of the meridian equal to 55,100 toises= 117,449 yds. (A later recalculation gave 57,033 toises = 121,569 yds., after the application of some corrections to the measures indicated by himself.) Snell also distinguished himself as a mathematician, and discovered the law of refraction, in 1621 (see LIGHT). He died at Leiden on the 3oth of October 1626. In addition to the Eratosthenes Batavus he published Cycloinetria live de circuhi dimen none (1621), and Tiphys Batavus s. Histiodromice, de navium cursi bus ci re navali (1624). He also edited Coeli et s-iderum in eo errantium 011 servationes Hassiacae (1618), containing the astronomical observations of Landgrave William IV. of Hesse. A trigonometry (Doctrina triangulorum,) by him was published a year after his death. JOHN SNELL SNIPE

27. 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 http://www.nahste.ac.uk/pers/s/GB_0237_NAHSTE_P1104/

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28. Encyclopedia: Willebrord Van Roijen Snell Supporter Benefits. Signup. Login. Sources. Home. Reviews. About. Questions. Forums. Contact. Encyclopedia. Correlations. Countries. Stats. Flags. Maps. Plots. Pies. Factoid 8. North Korea spends the most of its GDP on its military. Encyclopedia willebrord van Roijen snell. willebrord snell ( 15911626), also known as snell van Royen or snellius http://www.nationmaster.com/encyclopedia/Willebrord-van-Roijen-Snell

Supporter Benefits Signup Login Sources ... Pies Factoid #7 Israel enjoys a GDP per capita 21 times that of the Palestinian West Bank and 33 times that of the Gaza Strip . Its military spending per capita tops the world. Interesting Facts Make your own graph: Hold down Control and click on several. Compare All Top 5 Top 10 Top 20 Top 100 Bottom 100 Bottom 20 Bottom 10 Bottom 5 All (desc) in category: Select Category Agriculture Crime Currency Democracy Economy Education Energy Environment Food Geography Government Health Identification Immigration Internet Labor Language Manufacturing Media Military Mortality People Religion Sports Taxation Transportation Welfare with statistic: view: Correlations Printable graph / table Pie chart Scatterplot with ... * Asterisk means graphable. Added May 21 Mortality stats Multi-users ½ price Catholic stats Top Graphs Richest Most Murderous Most Populous Most Militaristic ... More Stats Categories Agriculture Background Crime Currency ... Welfare Updated: Apr 21, 2003 Encyclopedia : Willebrord van Roijen 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.

29. Untitled when you have one as your index of refraction. willebrord snell, willebrord snell, studied paths of rays bends along the way. willebrord snell, willebrord snell, studied paths of rays http://hokie.us/carols2002b.doc

Was the very first one he came up with Next an equation we always use To find a force that is equal to An object’s mass times acceleration That we measure in Newtons Ho! Ho! Ho! Who doesn’t know Ho! Ho! Ho! What this rule shows Force is always A proportion of mass times acceleration Next is the last of his three laws And this one means that for every action You‘ll always find that there will be One that is equal and opposite Ho! Ho! Ho! Who doesn’t know Ho! Ho! Ho! What this rule shows Newton was a genius <~b²$˖™Ù ‡™¡MÓ¦mʸeHÛm·[ÆݶÚ´M“¶al˜Á S̎ٲ˜õ†é?ã6l=Y²-K3!Ǟùæûî7š;÷ÞsÏ!Â; <„çš¼§À³€g ÏžƘ <×4Æ6ěŽg Ïž <xð,àY`ŒYÀsMclC¼éxð,àYÀ³€çš¼gÀ³€g ÏžƘ <×4Æ6ěŽg Ïž <xð,àY`ŒYÀsMclC¼éxð,àYÀ³€çš¼gÀ³€g ÏžƘ <×4Æ6ěŽg Ïž <xð,àY`ŒYÀsMclC¼éxð,àYÀ³€çš¼gÀ³€g ÏžƘ <×4Æ6ěŽg Ïž <xð,àY`ŒYÀsMclC¼éxð,àYÀ³€çš¼gÀ³€g ÏžƘ <×4a·Þ[¸g Ïžƪ¼ ÈXÝo^ž <xð,àY`ŒYÀ‹šÆ؆xÓñ,àYÀ³€g Ï5yπg Ïž <Œ1x®iŒmˆ7Ïž <Œ1x®iŒmˆ7Ïž <‹ä#Û㑐‰fLÂ*Ò´É6•Ï Dšã4çhÕ 5ÒÒ(š„ã³hÚá–ä4‚Á¯ÚàŒzg ·´Q:eŽ·sž <üžkòž ‰a­F_ <«+oéÕA¾sM6ß9½£ªO÷©šãÀ“â––N,@L€.Ïrï]!’ÍòvÀ;

30. Snell, Willebrord snell or snellius, willebrord, vil ubrôrt snel, snelEus PronunciationKey. snell or snellius, willebrord , 1591–1626, Dutch mathematician. http://www.factmonster.com/ce6/people/A0845695.html

Encyclopedia Snell or Snellius, Willebrord u E 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, Snell's law snipe 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:

31. BBC - History - Willebrord Van Roijen Snell (1580 - 1626) willebrord van Roijen snell (1580 1626). The son of a mathematicianand linguist, snell was originally intended to study law, but 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 TUESDAY 1st June 2004 Text only BBC Homepage History Topics ... 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. In 1617 he published his results, stating the distance of one-degree latitude to be 28 500 roods, or 107km. This implied the earth's circumference to be 38 500km, not far from the real figure of 40 000km. He repeated the experiment at a later date, when Leyden flooded and then froze, giving him a perfectly flat baseline from which to measure.

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. Snell, Willebrord snell, willebrord van Roijen. (15801626). Holandský fyzik a optik.Je objevitelem zákona lomu. Podrobne zkoumal krivku loxodromu. 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).

34. Knowledge ª¾ÃѺô "´µ¯I¦Õ Snell, Willebrord Van Roijen (1591~1626.10.3 The summary for this Chinese (Traditional) page contains characters that cannot be correctly displayed in this language/character set. http://www.knowledge.idv.tw/Document.asp?DocumentNo=5278

35. Willebrord Snell - Wikipedia, The Free Encyclopedia January 1, 1998 snell, willebrord (15801626 triangulation. http://en.wikipedia.org/wiki/Willebrord_van_Roijen_Snell

Willebrord Snell From Wikipedia, the free encyclopedia. (Redirected from Willebrord van Roijen 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 . 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 km ). The actual distance is approximately 111 km. Snell was also a distinguished mathematician, producing a new method for calculating the first such improvement since ancient times. He discovered the law of refraction that is named after him in . He died at Leiden on the October 30 In addition to the Eratosthenes Batavus he published Cyclometria sive de circuli dimensione ), and

36. HighBeam Research: ELibrary Search: Results snellIUS, willebrord snellius, willebrord see snell, willebrord. 4 snell, willebrord (15801626) was a Dutch physicist at http://www.highbeam.com/library/search.asp?FN=AO&refid=ency_refd&search_thesauru

37. Willebrord Snell - Ciencia.net - Noticias Científicas, Artículos willebrord snell . http://www.ciencia.net/VerArticulo/Willebrord-Snell?idArticulo=dsfjuww31aln4rlnp

38. Willebrord Snell Translate this page willebrord snell (c) (c) ciencia.net. http//www.ciencia.net//VerArticulo/willebrord-snell?idArticulo=dsfjuww31aln4rlnpcbyb2jc.willebrord http://www.ciencia.net/enciclo_imprimir.jsp?id=dsfjuww31aln4rlnpcbyb2jc

39. Willebrord Snell Van Royen [Wat Een Wetenschap!] willebrord snell van Royen. Natuurkunde. http://proto2.thinkquest.nl/~llc220/wetenschapper.php?id=11

40. Snell Van Royen [Wat Een Wetenschap!] willebrord snell van Royen Biografie willebrord snell van Royen werd geboren in1580 in Leiden. Hij gebruikte echter snellius als wetenschappelijke naam. http://proto2.thinkquest.nl/~llc220/printalles.php?id=11

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