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- Willebrord_Snellius abstract "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 first 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.The lunar crater Snellius is named after Willebrord Snellius.".
- Willebrord_Snellius academicAdvisor Ludolph_van_Ceulen.
- Willebrord_Snellius academicAdvisor Rudolph_Snellius.
- Willebrord_Snellius almaMater Leiden_University.
- Willebrord_Snellius birthDate "1580".
- Willebrord_Snellius birthDate "1580-06-13".
- Willebrord_Snellius birthPlace Dutch_Republic.
- Willebrord_Snellius birthPlace Leiden.
- Willebrord_Snellius birthPlace Netherlands.
- Willebrord_Snellius birthYear "1580".
- Willebrord_Snellius deathDate "1626-10-30".
- Willebrord_Snellius deathPlace Dutch_Republic.
- Willebrord_Snellius deathPlace Leiden.
- Willebrord_Snellius deathPlace Netherlands.
- Willebrord_Snellius deathYear "1626".
- Willebrord_Snellius field Astronomy.
- Willebrord_Snellius field Mathematics.
- Willebrord_Snellius knownFor Snell's_law.
- Willebrord_Snellius nationality Dutch_people.
- Willebrord_Snellius notableStudent Jacobus_Golius.
- Willebrord_Snellius thumbnail Willebrord_Snellius.jpg?width=300.
- Willebrord_Snellius viafId "27367208".
- Willebrord_Snellius wikiPageExternalLink v=onepage&q=&f=false.
- Willebrord_Snellius wikiPageExternalLink snell.htm.
- Willebrord_Snellius wikiPageExternalLink 14Haasbroek.pdf.
- Willebrord_Snellius wikiPageID "213858".
- Willebrord_Snellius wikiPageRevisionID "604011974".
- Willebrord_Snellius academicAdvisors Ludolph_van_Ceulen.
- Willebrord_Snellius academicAdvisors Rudolph_Snellius.
- Willebrord_Snellius almaMater Leiden_University.
- Willebrord_Snellius authorlink "Dirk Jan Struik".
- Willebrord_Snellius birthDate "1580-06-13".
- Willebrord_Snellius birthPlace Dutch_Republic.
- Willebrord_Snellius birthPlace Leiden.
- Willebrord_Snellius caption "Willebrord Snel van Royen".
- Willebrord_Snellius dateOfBirth "1580".
- Willebrord_Snellius dateOfDeath "1626-10-30".
- Willebrord_Snellius deathDate "1626-10-30".
- Willebrord_Snellius deathPlace Dutch_Republic.
- Willebrord_Snellius deathPlace Leiden.
- Willebrord_Snellius field "Astronomer and mathematician".
- Willebrord_Snellius first "Dirk Jan".
- Willebrord_Snellius hasPhotoCollection Willebrord_Snellius.
- Willebrord_Snellius id "Snell".
- Willebrord_Snellius imageSize "200".
- Willebrord_Snellius knownFor Snell's_law.
- Willebrord_Snellius last "Struik".
- Willebrord_Snellius name "Snellius, Willebrord".
- Willebrord_Snellius name "Willebrord Snellius".
- Willebrord_Snellius nationality Dutch_people.
- Willebrord_Snellius notableStudents Jacobus_Golius.
- Willebrord_Snellius placeOfBirth Leiden.
- Willebrord_Snellius placeOfBirth Netherlands.
- Willebrord_Snellius placeOfDeath Leiden.
- Willebrord_Snellius placeOfDeath Netherlands.
- Willebrord_Snellius shortDescription "Astronomer and mathematician".
- Willebrord_Snellius title "Snel, Willebrord".
- Willebrord_Snellius title "Willebrord van Royen Snell".
- Willebrord_Snellius volume "XII".
- Willebrord_Snellius wordnet_type synset-scientist-noun-1.
- Willebrord_Snellius workInstitution Leiden_University.
- Willebrord_Snellius description "Astronomer and mathematician".
- Willebrord_Snellius description "Astronomer and mathematician".
- Willebrord_Snellius subject Category:1580_births.
- Willebrord_Snellius subject Category:1626_deaths.
- Willebrord_Snellius subject Category:17th-century_mathematicians.
- Willebrord_Snellius subject Category:Burials_at_Pieterskerk,_Leiden.
- Willebrord_Snellius subject Category:Dutch_astronomers.
- Willebrord_Snellius subject Category:Dutch_mathematicians.
- Willebrord_Snellius subject Category:Geodesists.
- Willebrord_Snellius subject Category:Leiden_University_faculty.
- Willebrord_Snellius subject Category:Mathematics_educators.
- Willebrord_Snellius subject Category:Opticians.
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