Origins & Early Life

ʿAbd al-Raḥmān al-Ṣūfī (full name: Abū’l-Ḥusayn ʿAbd al-Raḥmān ibn ʿUmar ibn Sahl al-Ṣūfī al-Rāzī —Arabic: أَبُو الحُسَين عَبدُ اَلرَّحمَن بن عُمَر بن سَهل اَلصُّوفِي اَلرَّازِي; Persian: ابوالحسن عبدالرحمن صوفی رازی — 7 December 903 – 25 May 986) was a Persian astronomer. His work, Kitāb ṣuwar al-kawākib ("The Book of Fixed Stars"), completed in 964, included both textual descriptions and illustrations. The Persian polymath Al-Biruni noted that al-Ṣūfī's work on the ecliptic was conducted in Shiraz. Al-Ṣūfī lived at the Buyid court in Isfahan.

Pivotal Works & Achievements

ʿAbd al-Raḥmān al-Ṣūfī was one of the nine famous Muslim astronomers. He lived at the court of Emir 'Adud al-Dawla in Isfahan and worked on translating and expanding ancient Greek astronomical works, especially the Almagest of Ptolemy. He made corrections to Ptolemy's star list, and his estimations of star brightness and magnitude deviated from those of Ptolemy; just over half of al-Ṣūfī's magnitudes were identical to Ptolemy's. A Persian, al-Ṣūfī wrote in Arabic, the lingua franca of the scientific Muslim world. Al-Ṣūfī was a major contributor to the translation into Arabic of Hellenistic astronomy, which had been centered in...

Enduring Legacy & Impact

The historical impact and works continue to influence the modern world.

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