Willebrord Snellius
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Snell is best known for discovering the law of refraction of light, now known as Snell's law, his pioneering work in survey known as Snellius's triangulation, and the Snellius–Pothenot problem, a mean
Willebrord Snel van Royen (1580–1626)
Quadrant of Snellius, Museum Boerhaave, Leiden
Snellius's Triangulation (1615)
Commemorative plaque on Snellius's house in Leiden
Triangulation (surveying)
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In surveying, triangulation is the process of determining the location of a point by measuring only angles to it from known points at either end of a fixed baseline by using trigonometry, rather than
Willebrord Snellius
…and mathematician. Snell is best known for discovering the law of refraction of light, now known as Snell's law, his pioneering work in survey known as Snellius's triangulation, and the Snellius–Pothenot problem, a means in planar trigonometry of finding an unknown point from known ones. Despite being commonly attributed to…
Triangulation of Kodiak Island in Alaska in 1929.
Liu Hui (c. 263), How to measure the height of a sea island. Illustration from an edition of 1726
Gemma Frisius's 1533 proposal to use triangulation for mapmaking