 A large part of Herman's translation was copied into Roger of Hereford's "Book of Astronomical Judgements".Herman produced a version of Muḥammad ibn Mūsā al-Ḵwārizmī's astronomical tables ("zij") – they were also translated in 1126 by Adelard of Bath (1075–1164).Charles Burnett (2001) postulates that Herman collaborated with Robert of Ketton and Hugo of Santalla on the "Liber novem iudicum" (the Book of Nine Judges), a collection of translations of Arabic astrologers, notably al-Kindi.