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Willebrord Snellius
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High Quality Content by WIKIPEDIA articles! Willebrord Snellius (born Willebrord Snel van Royen) (1580?30 October 1626, Leiden) was a Dutch astronomer and mathematician. In the west, especially the English speaking countries, his name has been attached to the law of refraction of light for several centuries, but it is now known that this law was discovered by Ibn Sahl in 984. The same law was also investigated by Ptolemy and in the Middle Ages by Witelo, but due to lack of adequate mathematical instruments (trigonometric functions) their results were saved as tables, not functions.

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High Quality Content by WIKIPEDIA articles! Willebrord Snellius (born Willebrord Snel van Royen) (1580?30 October 1626, Leiden) was a Dutch astronomer and mathematician. In the west, especially the English speaking countries, his name has been attached to the law of refraction of light for several centuries, but it is now known that this law was discovered by Ibn Sahl in 984. The same law was also investigated by Ptolemy and in the Middle Ages by Witelo, but due to lack of adequate mathematical instruments (trigonometric functions) their results were saved as tables, not functions.