 Circa 1140 Herman translated into Latin the astronomical work of Abu Ma'shar "Kitab al-madkhal ila ilm ahkam al nujum" ("Introduction to Astronomy").The work contains problems from Greek philosophy, Arabic astronomy and Eastern astrology, and was first translated into Latin by John of Seville in 1133.Herman's less literal translation was published several times under the title "Liber introductorius in astronomiam Albumasaris, Abalachii" (Augusta Vindelicorum, Augsburg 1489; Venice 1495 and 1506).