Curriculum vitae

Complete list of publications (1972 to 2011)

Information about four recent books

The Ciphers of the Monks:~ A forgotten number notation of the Middle Ages (2001)

Studies in astronomical timekeeping in medieval Islam (2004-05)   

From Regiomontanus’ acrostic for Cardinal Bessarion to Piero della Francesca’s enigma (2007)

Astrolabes from Medieval Europe (2011)

Islamic Astronomy and Geography (2012)

Other pages on this website

An ordered list of medieval Islamic and European astronomical instruments

Bibliography of writings on astronomy and mathematics in early Islamic Baghdad

Website of the former Institut für Geschichte der Naturwissenschaften in Frankfurt, Germany