al-Qanūn al-Masʿūdī القانون المسعودي

An early and complete copy of the comprehensive astronomical work, or Canon , by Abū al-Rayḥān Muḥammad ibn Aḥmad al-Bīrūnī (أبو الريحان محمد بن أحمد البيروني, ca 973-1048). The al-Qanūn al-M asʿūdī was dedicated to Sultan Mas‘ūd of Ghaznī (reg. 1030-1040), and summarises the astronomy of the Almagest (كتاب المجسطي) of Ptolemy (Claudius Ptolemaeus; c 90-c 168) and brings it up to date by adjusting stellar longitudes to account for the almost nine centuries elapsed between the two authors, and by adding astronomical advancements drawn from Arabic, Persian and Sanskrit sources.