The Achievement of the Guardians of Iranian-Islamic Civilization in Ilkhani Period

The achievements of each nation in the ground of civilization prepare a national valuable property whose information is very important. Among such achievements in Ilkhani period of Iran may be counted Maragheh Observatory and Rab'-e Rashidi. They were established respectively by Khawjah Nasir al-Din Tusi and Rashid al-Din Hamedani. Khawjah Nasi established a civilization at that time and, after a short cultural stoppage, Rashid al-Din went on with it. Regarding the subject, this paper has intended to study the cases of civilization in that period comparatively to find their connections with each other.