Presentatie ouderdag, 6 april 2013.
Lezing: Wiskunde en Islamitische cultuur, 27 februari 2013, Studium Generale, 400 jaar Arabisch, Leiden.
Lezing over een Arabisch astronomisch handschrift in de Universiteitsbibliotheek in Utrecht, de Utrecht Zij. Feb. 2013.
Otto Neugebauer Lecture, Kraków, 6th European Mathematics Conference, July 2: Presentation Written form of lecture
Presentation: Inspired science: methods for finding the qibla in the medieval Islamic tradition
Umm al-Qura University, Mecca, Saudi Arabia, April 17, 2012.
Two presentations/workshops for the visit of 23 students and professors of KFUPM to Utrecht on March 23, 2012
Presentation: Scientific computing in medieval Islamic civilization
Presentatie: enkele achtergronden van Islamitische mozaieken, 27 augustus 2011
Webpage belonging to the talk "De zonnecirkel"
(the solar circle) at the Nationale Wiskundedagen, January 29, 2011.
Presentation: Three mathematicians and their interactions: Ludolph van Ceulen, Adriaan van Roomen, Joseph Justus Scaliger (1590-1600)
Lorentz Center Conference: Mathematical Life in the Dutch Republic, Leiden, December 7, 2010.
Presentation: Dead texts versus living teachers:
remarks on the transmission of Greek mathematics into Arabic.
History of Science Society Meeting, Montreal, August 6, 2010.
Lecture: Three instruments for finding the direction and distance to Mecca: European cartography or Islamic astronomy?
Istanbul, IRCICA, Islamic Astronomy Panel, May 7, 2010.
Lecture: Ahmad ibn Mohammad ibn Abdaljalil Sagzi: a Sistani Scientist from the Fourth Century Hijra,
Zahedan University, and Zabol Mehbang Astronomical Society, May 23-25, 2006.
2013
Berekening van de oppervlakte van de donut.
Deel 1
Deel 2
Mecca clock tower trailer
Presentation on the Mecca-finder, presentation on the astrolabe.
Presentation on Islamic tilings and infinity, Part 1, Part 2.
Deel 1
Deel 2
Primitieve versie van de astrolabium-workshop
Artikel over het principe van het astrolabium: John North, The Astrolabe,
Scientific American 230:1, pp. 96-106 (January, 1974).