Abu al‐Qasim Ahmad ibn Abd Allah ibn Umar al‐Ghafiqī ibn al-Saffar al‐Andalusi (Born in Cordoba, died in the year 1035 at Denia), Ibn al-Saffar (literally: son of the brass worker). He was a close colleague and astronomer at the school founded by Al-Majriti in Córdoba. His best known work was a treatise on the Astrolabe, the work was still published until the 15th century and influenced the work of Kepler, he also writes a commentary on the Zij al-Sindhind, and measured the coordinates to Mecca.
David A. King, historian of Islamic instrumentation, describes the universal astrolobe designed by Ibn al-Sarraj in the early 14th century as "the most sophisticated astronomical instrument from the entire Medieval and Renaissance periods".
Ibn al-Saffar later influenced the works of Abu al-Salt.
- Rius 2007.
- Harley, J. B.; Woodward, David (1992). The history of cartography. Chicago: Univ. of Chicago Press. p. 31. ISBN 0-226-31635-1.
- Rius, Mònica (2007). "Ibn al‐Ṣaffār: Abū al‐Qāsim Aḥmad ibn ʿAbd Allāh ibn ʿUmar al‐Ghāfiqī ibn al‐Ṣaffār al‐Andalusī". In Thomas Hockey; et al. The Biographical Encyclopedia of Astronomers. New York: Springer. pp. 566–7. ISBN 978-0-387-31022-0. (PDF version)