* The Dutch mathematician and astronomer, Willebrord Snel van Royen ( 1580 – 1626 ), discovers the famous law of refraction, also known as " Snellius ' law ".

** Willebrord Snellius, Dutch astronomer and mathematician ( d. 1626 )

Although named after Dutch astronomer Willebrord Snellius ( 1580 – 1626 ), the law was first accurately described by the Arab scientist Ibn Sahl at Baghdad court, when in 984 he used the law to derive lens shapes that focus light with no geometric aberrations in the manuscript On Burning Mirrors and Lenses ( 984 ).

In 1621, Willebrord Snellius ( Snel ) derived a mathematically equivalent form, that remained unpublished during his lifetime.

The University of Leiden is famous for its many developments including Snells law ( by Willebrord Snellius ),

Willebrord Snellius ( born Willebrord Snel van Royen ) ( 1580 – 30 October 1626, Leiden ) was a Dutch astronomer and mathematician.

The lunar crater Snellius is named after Willebrord Snellius.

Willebrord Snellius was born in Leiden, Netherlands.

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# REDIRECT Willebrord Snellius

Several have tried to restore the text to discover Apollonius's solution, among them Snellius ( Willebrord Snell, Leiden, 1698 ); Alexander Anderson of Aberdeen, in the supplement to his Apollonius Redivivus ( Paris, 1612 ); and Robert Simson in his Opera quaedam reliqua ( Glasgow, 1776 ), by far the best attempt.

The English mathematicians Thomas Harriot and Isaac Newton, and the Dutch physicist Willebrord Snellius, the French mathematicians Pierre de Fermat and Blaise Pascal all used Vieta's ratings.

* Willebrord Snellius formulates Snell's law on refraction.

* Willebrord Snellius ( 1580 – 1626 ), a Dutch astronomer and mathematician, most famous for the law of refraction now known as Snell's law

* Willebrord Snellius, Dutch mathematician and physicist who devised the basic law of refraction, Snell's law ( died 1626 )

* Isaac Beeckman, Rudolf Snellius, Willebrord Snellius ;

Willebrord Snellius ( 1580 – 1626 ) found the mathematical law of refraction, now known as Snell's law, in 1621.

A 1586 pair survives, the celestial globe based on astronomical data provided by Rudolf Snellius father of Willebrord Snellius, while Petrus Plancius collaborated on the 1589 edition.

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* October 30-Willebrord Snellius, Dutch mathematician and physicist who devised the basic law of refraction, known as Snell's law ( born 1580 )

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* Snellius – Pothenot problem

* Rudolph Snellius ( 1546 – 1613 ), a Dutch linguist and mathematician at the Universities of Marburg and Leiden

Subsequently Rudolph Snellius brought him to Marburg, and enabled Arminius to study theology at the University of Leiden.

It was established by Leiden University in 1633, to house the quadrant of Snellius, and is the oldest operating University observatory in the world ( before this, astronomy taught at medieval universities tended to be of a more theoretical nature, and any observations were usually done with private equipment rather than at University observatories — see this timeline ).

Beeckman's most influential teachers in Leiden probably were Snellius and Simon Stevin.

He continued his studies at Leiden in 1594, where he studied under Rudolph Snellius.

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* 1621 — Willebrord van Roijen Snell states his Snell's law of refraction

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