  8.2 Al-Bitruji, Principles of Astronomy  In the glossary, commentary on Ecclesiastes, and Ma’amar Yiqqawu ha-Mayim, Ibn Tibbon presents a brief summary of al-Bitruji’s astronomy; these were the first appearances of Bitruji’s novel theories in Hebrew. In the following generation, the entire text of al-Bitruji was translated by Samuel’s son Moses.