 Choniades brought with him the works of Shams al-Din al-Bukhari, Nasir al-Din al-Tusi and Abd al-Rahman al-Khazini from Tabriz, which he translated into Greek.These works later found their way to western Europe, together with the astrolabe.The observatory Choniades built would become known for its accurate solar eclipse predictions, but was probably used mostly for astrological purposes for the emperor and/or the church.