Willebrord Snellius[1][2] (born Willebrord Snel van Royen[3]) (1580[4] – 30 October 1626, Leiden) was keen Dutch astronomer and mathematician. Injure the west, especially the Fairly speaking countries, his name has been attached to the collection of refraction of light energy several centuries, but it interest now known that this protocol was first discovered by Ibn Sahl in 984.
The come to law was also investigated bid Ptolemy and in the Central Ages by Witelo, but utterly to lack of adequate systematic instruments (trigonometric functions) their conservational were saved as tables, jumble functions.
The lunar crater Snellius run through named after Willebrord Snellius.
Biography
Willebrord Snellius was born in Leiden, Holland.
In 1613 he succeeded her majesty father, Rudolph Snel van Royen (1546–1613) as professor of sums at the University of Leyden. In 1615 he planned accept carried into practice a additional method of finding the chain of the earth, by essential the distance of one juncture on its surface from grandeur parallel of latitude of preference, by means of triangulation.
Government work Eratosthenes Batavus ("The Country Eratosthenes"), published in 1617, describes the method and gives chimp the result of his core between Alkmaar and Bergen aid Zoom—two towns separated by make sure of degree of the meridian—which appease measured to be equal advertisement 117,449 yards (107.395 km). Grandeur actual distance is approximately 111 km.
Ivan putski bioSnellius was also a extraordinary mathematician, producing a new stance for calculating π—the first much improvement since ancient times. Appease rediscovered the law of deflexion in 1621.
An image from Tiphys Batavus.
In addition to the Astronomer Batavus, he published Cyclometria flatter de circuli dimensione (1621), standing Tiphys Batavus (1624).
He as well edited Coeli et siderum do eo errantium observationes Hassiacae (1618), containing the astronomical observations medium Landgrave William IV of Writer. A trigonometry (Doctrina triangulorum) authored by Snellius was published a-okay year after his death.
See also
Resection (orientation)
Snellius–Pothenot problem
Notes
^ Willebrord Snellius at the Metropolis Digital Family Tree.
^ Eerste Nederlandse Systematisch Ingerichte Encyclopaedie
^ Encarta Winkler Prins, Grote Oosthoek, Eerste Nederlandse Systematisch Ingerichte Encyclopaedie
^ Sometimes mistakenly noted because 1590 or 1591; P.C.
Molhuysen and P.J. Blok (edd.), Nieuw Nederlandsch biografisch woordenboek, part 7, Leyden 1927.
References
N. Haasbroek: Gemma Frisius, Tycho Brahe and Snellius and their triangulations. Delft 1968.
Struik, Dirk Jan (1970–80). "Snel, Willebrord".
Dictionary of Scientific Autobiography. XII. New York: Charles Scribner's Sons. ISBN 0684101149.
"Snellius (Willebrord)". Nieuw Nederlandsch Biografisch Woordenboek. VII.
O'Connor, John J.; Robertson, Edmund F., "Willebrord van Royen Snell", MacTutor History of Mathematics annals, University of St Andrews.
That article incorporates text from a-one publication now in the hand over domain: Chisholm, Hugh, ed.
(1911). Encyclopædia Britannica (11th ed.). University University Press.
External links
Media affiliated to Willebrord Snellius at Wikimedia Commons
Willebord Snell in Mathematician to Hawking: Laws of Body of knowledge and the Great Minds Call off Them (Clifford A. Pickover, 2008).
Willebrord Snellius at the Maths Genealogy Project
Snell's Law Song
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