Willebrord snellius biography definition

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Dictionary of Scientific Biography. Snell used triangulation, a method he came up with, to calculate the distance between two towns that were on the same meridian. Delft 1968.
Struik, Dirk Jan (1970–80). In his work The terrae Ambitus vera quantitate (1617) under the author's name ("The Dutch Eratosthenes") Snellius describes the methods he used.

He also edited Coeli et siderum in eo errantium observationes Hassiacae (1618), containing the astronomical observations of Landgrave William IV of Hesse. Snell came up with his more accurate approximation by adding more sides to the polygons who's lengths and areas he was calculating, and divided their area by three. Comm., Delft.

Willebrord Snell was accepted into college where he pursued a law career due to his father's wishes but continued studying and teaching math in place of his father when he was not able to do so himself. In a network of fourteen cities a total of 53 triangulation measurements were made. His name is usually associated with the law of refraction of light known as Snell's law.^[5]

The lunar craterSnellius is named after Willebrord Snellius.

The law of refraction is n1*sin(x1) = n2*sin(x2) where n1 in the index of refraction of one substance and x1 is the angle that light bends away from the normal in that substance, and n2 is the second index of refraction with x2 being the corresponding angle. Publ.Netherl. Nieuw Nederlandsch biografisch woordenboek. 978-3-11-025000-8 . The actual distance is approximately 111 km.

De Gruyter . There were hardly any other tall buildings at that time in the west of the Netherlands. https://ncgeo.nl/downloads/14Haasbroek.pdf