Ibn al-Saffar
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), also known as Ibn al-Saffar (, literally: son of the brass worker), was a Spanish-Arab astronomer in Al-Andalus. He worked at the school founded by his colleague Al-Majriti in Córdoba. His best-known work was a treatise on the astrolabe, a text that was in active use until the 15th century and influenced the work of Kepler. He also wrote a commentary on the Zij al-Sindhind, and measured the coordinates  of Mecca. Ibn al-Saffar later influenced the works of Abu al-Salt. Paul Kunitzsch argued that a Latin treatise on the astrolabe long attributed to Mashallah, and used by Chaucer to write "A Treatise on the Astrolabe", is in fact written by Ibn al-Saffar. The exoplanet Saffar, also known as Upsilon Andromedae b, is named in his honor. Saffar Island in Antarctica is named after Ibn al-Saffar.