Rasad Khaneh Marageh (Observatory of Maragheh) was constructed almost 800 years ago, at a time when there was still no astronomical telescope. Maragheh observatory was known for many years as the most advanced observatory in the world.
Maragheh abservatory is a reminder of the golden age of Iranian science and culture in the world. This was scientific and astronomy place built by Khaje Nasir al-Din Tusi, philosopher, mathematician and astronomer of Ilkhani era.
Tusi convinced Hulegu Khan to construct an observatory for establishing accurate astronomical tables for better astrological predictions. Beginning in 1259, the Rasad Khaneh observatory was constructed in Maragheh. By this way, he could get scholarship of astronomical studies for scientists and he gathered most of famous scientists from all around the world to this place.
Tusi made very accurate tables of planetary movements as depicted in his book Zij-i ilkhani (Ilkhanic Tables). This book contains astronomical tables for calculating the positions of the planets and the names of the stars. His model for the planetary system is believed to be the most advanced of his time, even up to more than 200 years later.