 These include the introduction of the universal latitude-independent astrolabe to Europe and a Greek description of the Tusi-couple, which would later have an influence on Copernican heliocentrism.Choniades also translated several "Zij" treatises into Greek, including the Persian "Zij-i Ilkhani" by al-Tusi and the Maragheh observatory as well as the Seljuk "Sanjaric Tables" by Al-Khazini, an Islamic astronomer of Byzantine Greek descent.Choniades resided in Tabriz, at the time the Mongol capital, from 1295 to 1296, serving as the Orthodox Bishop to the Orthodox living in that city, and later returned to Constantinople.