Abu'l-Husayn 'abd al-Rahman ibn ‘Umar al-Sufi (d. 998 AD) was born in Rayy and was a well known astronomer, friend and teacher of the Buyid Sultan ‘Adud al-Dawla (r.978-983 AD).
Copies of the Kitab (Risalat) al-‘amal bi’l-asturlab can be found in libraries in Istanbul, Paris, St. Petersburg and Tehran. The first Paris manuscript contains 386 chapters; the Istanbul manuscripts contain 170 and 402 chapters. In the forward to the first Istanbul manuscript, it was written that this was an abridgment of the original text, which contained 1760 chapters and was dedicated to the Buyid Amir of Fars Sharaf al-Dawla. See also B.A. Rosenfeld – E. Ihsanoglu, Mathematicians, Astronomers & Other Scholars of Islamic Civilisation and their Works (7th – 19th C.), Istanbul, 2003, pp.86 -87, no.212; or Brockelmann, GAL, I. 254, Suppl. II. 214.