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Encyclopedia Britannica



SNELL, WILLEBRORD (1591-1626)

This article appears in Volume V25, Page 293 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: SIV-SOU
SNELL, WILLEBRORD (1591-1626) , commonly known as SNELLIUS, Dutch astronomer and mathematician, was born at Leiden in 1591. In 1613 he succeeded his father Rudolph Snell (15461613) 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
 -op-Zoom 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 Cyclometria sive de circuli dimen,.ione (1621), and Tiphys Batavus s. Histiodromice, de navium cursibus et re navali (1624). He also edited Coeli et siderum in eo errantium observationes Hassiacae (1618), containing the astronomical observations of Landgrave
William
  IV. of Hesse. A
trigonometry
  (
Doctrine
  triangulorum,) by him was published a year after his death.


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