The Fatimid astronomer whose meticulous observations, gathered in the Hakimi Tables, were among the most accurate of the medieval age.
Life
Ibn Yunus (c. 950–1009) worked in Cairo under the Fatimid caliphs, compiling the great az-Zij al-Hakimi al-Kabir, astronomical tables based on careful observation of eclipses and planetary positions. His work advanced trigonometry and timekeeping, and his eclipse records were later used by modern astronomers to study the Earth's rotation. He is remembered as one of the finest observational astronomers of the Islamic golden age.