Abd al-Rahman al-Sufi

Abd al-Rahman al-Sufi, known in the West as Azophi, was a Persian astronomer who worked at the court of the Buyid dynasty in Isfahan. His masterwork, the Book of Fixed Stars (Kitab suwar al-kawakib), was a thorough revision of Ptolemy's star catalog. Al-Sufi re-observed each of Ptolemy's 1,022 stars, correcting positions and magnitudes, and added Arabic star names that persist today — names like Aldebaran, Altair, and Betelgeuse. Most famously, he provided the first recorded observation of the Andromeda Galaxy, describing it as a "small cloud" near the constellation Andromeda. He also made the first known reference to the Large Magellanic Cloud, observed from southern Yemen. His work served as a bridge between Greek and Islamic astronomy and deeply influenced European star catalogs of the Renaissance.

First recorded observation of the Andromeda Galaxy (M31), describing it as a "nebulous smear." First known mention of the Large Magellanic Cloud. Revised and corrected Ptolemy's star catalog with updated magnitudes and positions. Preserved and transmitted Arabic star names (Aldebaran, Altair, Betelgeuse, Deneb, Rigel, Vega) still used today. Created detailed constellation illustrations combining Greek and Arabic traditions.