A number of other prominent astronomers worked with Tusi there, such as Muhyi al-Din al-Maghribi, Mu'ayyid al-Din al-'Urdi, from Damascus, Qutb al-Din al-Shirazi, and Hulagu's Chinese astronomer Fao Munji whose Chinese astronomical experience brought improvements to Ptolemaic system used by Tusi.
And after 12 years of intense work by Khaje Nassir od-Din Tussi and the other prominent scientists the observations and planetary models were compiled in the Zij-i Ilkhani, which later still influenced Copernicus.