Maragheh observatory (Persian: نپاهشگاه مراغه), was an institutionalized astronomical observatory which was established in 1259 CE under the patronage of the Ilkhanid Hulagu and the directorship of Nasir al-Din al-Tusi, a Persian scientist and astronomer. Located in the heights west of Maragheh, which is today situated in the East Azerbaijan Province of Iran, it was once considered one of the most prestigious observatories in the world.
It was financed by waqf revenues, which allowed it to continue to operate even after the death of its founder and was active for more than 50 years. The observatory served as a model for later observatories including the 15th-century Ulugh Beg Observatory in Samarkand, the 16th-century Taqi al-Din observatory in Istanbul, and the 18th-century Jai Singh observatory in Jaipur.
Considerable parts of the groundwork are preserved in the ruins. In a 340 to 135 m² citadel-like area stood a four-story circular stone building of 28 m diameter. The mural quadrant to observe the positions of the stars and planets was aligned with the meridian. This meridian served as Prime meridian for the tables in the Zij-i Ilkhani, as we nowadays apply the meridian which passes the Royal Greenwich Observatory.
When Tusi complained that his astronomical tables were outdated, Hulagu gave a permission to build a new observatory in a place of Tusi's choice. According to books like Jam-e-ttavarikhe rashidi (Persian: جامع التواريخ رشيدي), saf-e-elhofreh (Persian: صاف الحفره), favat-o-lvafiyyat (Persian: فوات الوفيات) the building of the rasad khaneh started in 1259 (657 A.H.). The library of the observatory contained 40,000 books on many subjects, related to astrology/astronomy as well as other topics. Bar-Hebraeus late in his life took residence close to the observatory in order to use the library for his studies. He has left a description of the observatory.
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.
For his planetary models, Tusi invented a geometrical technique called a Tusi-couple, which generates linear motion from the sum of two circular motions. He also determined the precise value of 51 arcsec for the annual precession of the equinoxes and contributed to the construction and usage of some astronomical instruments including the astrolabe.
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. The tables were published during the reign of Abaqa Khan, Hulagu's son, and named after the patron of the observatory. They were popular until the 15th century.
It is not known with certainty until when it had been active. It turned into ruins as a result of frequent earthquakes and lack of funding by the state. Shah Abbas the Great arranged for repair, however, this was not commenced due to the king's early death.
A star globe from the observatory made in 1279 is now preserved in Dresden, Germany. It is a rare example of decorative art from Iran of the 13th century, designed by M. Ordi and made of bronze, inlaid with silver and gold.
To save the installation from further destruction, Cultural Heritage Organization of Iran built a dome-framed shelter and it plans to hold an exhibit of astronomical devices used at Maragheh observatory.
The observatory is currently covered with a dome-framed brass structure and is situated two miles west of Maragheh.
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- Maragheh observatory at Iranian Cultural Heritage Organization Documentation Center
- Research Institute for Astronomy and Astrophysics of Maragha
- On Maragheh observatory at RIAAM
- Contribution by Parviz Tarikhi with illustrations
- Inside the protecting dome
- Copy of the celestial globe
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