Maragheh Observatory; realizing contemporary visions in far past


Maragheh Observatory; realizing contemporary visions in far past

Parviz Tarikhi

Spring 2008

Exploratory Article about Maragheh, my birthplace and its famous Maragheh Observatory, my personal website, April 2008, 9 pages



Space Age began in 1957 following the launch of Sputnik, the first man-made satellite to space by Soviet Union. As a glorious start for the humanity, the enormous efforts and endeavor of many courage scientists and the men of practice and knowledge who contributed to make possible the earliest dream of the man backed it indeed. Establishing Maragheh Observatory is the earliest systematic approach to observe and monitoring celestial phenomena and paving the way to step towards space. The Observatory was situated in Maragheh (Marāghé or Marāgha), a city in northwestern Iran and founded by Khajeh Nasir al-Din al-Tusi. 


Maragheh at a glance

At the elevation of 1,619 m above sea level Maragheh is a city with more than 300,000 inhabitants in the East Azerbaijan Province of Iran. It is an ancient city situated in a narrow valley running nearly north and south on the southern slopes of Mount Sahand.

The city is situated at the eastern extremity of a well-cultivated plain opening towards Lake Orumiyeh, which lies 22 km to the west. Based on the bank of the Safi Chai River Maragheh is surrounded by the extensive vineyards and orchards, all well irrigated by canals led from the river, and producing great quantities of fruits. It is a trade and transportation center for exporting both fresh and dried fruits. The western hills of the town consist of horizontal strata of sandstone covered by irregular pieces of basalt. For more than a decade the Alavian Dam in northwest of the town acts as the reservoir for the water from Safi Chai.

The city is linked by road to Tabriz, 130 km north, and Teheran, 535 km east. Since decades ago railway has been the traditional linkage mean between Maragheh, Tabriz, Tehran and other cities in between. Maragheh’s Airport receives few weekly flights from Tehran and vice versa.

Maragheh is very rich in natural and cultural resources. In the central part of the city the old architectural structures were preserved for years. The tranquility and privacy of the old houses with great yards full of green plants, flowers and fruit trees provide wonderful and fantastic moments specially in dawn and late in the evening to relax, enjoy and think about the beauty and charm of life and existence.

City’s traditional bazaar is worth visiting; there is large number of workshops and stores in which craftsmen work and sell the products of their art and talent. Modern businesses also emerge in Maragheh. There are many leisure places around the city among which the mineral water springs such as Varjovi, Gushayesh, Sari Su, Shour Su, and Okouz Boughaz worth to be mentioned. Lots of picturesque areas around the Alavian Dam attract the attention and interest of visitors.


City’s past

Maragheh is one of the oldest and historic towns of Iran. In 7th Christian century Arab Muslims conquered the region of Maragheh. During the liberation battles of Babak Khorramdeen with Arabs, the town was the headquarters of the Arab army. After the Arab conquest in the 7th century Maragheh developed rapidly as a provincial capital. The Oghuz Turks (Seljuqs) seized the city in 1029 and developed it into an important city, but a Kurdish chief who established a local dynasty drove them out. The Mongols destroyed the city in 1221, but Hulaku Khan held court there until the establishment of a fixed capital at Tabriz. Maragheh basically has a firm connection with the Mongols Dynasty, who made it the capital of Azerbaijan for some time, presumably due to the excellent grazing for their countless horses, and between 1259-62, in the time of Hulaku, built an astronomical observatory and a university for Khajeh Nasir al-Din al-Tusi in 15 years and within a distance of 2 kilometers to the west of the town. Hulaku Khan (1217-1265) selected Maragheh in 1256 as the capital of the Ilkhanate Empire ruling over most of Persia. Shortly thereafter it became the seat of the Church of the East Patriarch Mar Yaballaha III.

In 1828 the city was temporarily occupied by Russians, and from 1914 to 1917, it was the site of fighting between the Ottomans and the Russians; the fight that stopped as a result of the Bolshevik Revolution in Russia in October 1917 and establishment of the Soviet Union. During the World War II, Maragheh was under the governance of a local state that was supported by the Soviet Union for nearly a year.   


Maragheh Observatory

Maragheh Observatory (Rasad Khaneh in local language, Azerbaijani) is an ancient observatory, which was established in 1259 by Khajeh Nasir al-Din al-Tusi (1201-1274), the remarkable Iranian scientist and astronomer. Rasad Khaneh was once the most prestigious observatory in the world; it still preserves its magnificence and glory on the western hills of Maragheh called Talebkhan Hills.

A considerable archaeological and historical studies as well as groundwork has been made on the remnants of Maragheh Observatory. It is now revealed that the Observatory was a four-story circular stone building of 28 m of diameter constructed in a 340 to 135 m2 citadel-like area. The mural quadrant to observe the positions of the stars and planets was aligned with the meridian, which served as Prime Meridian (reference meridian) for the tables in the Zij-i Ilkhani, an astronomical almanac; nowadays the reference meridian is the one, which passes the Royal Greenwich Observatory in the United Kingdom.

In 1253 AD, the Mongols began their invasion to Persia and the Caucasus. This event, as strange as it may sound, was very beneficial for Khajeh Nasir, who was held captive at Alamout, in Qazvin for many years by the Assassins- a religious clandestine terrorist group ruling in Persia and led by Hassan Sabbah. The Mongolian occupation led to release of Khajeh Nasir and his freedom.

It is said that it was Khajeh Nasir who persuaded Hulaku Khan to continue his attack to Baghdad and destroy the Abbasid Caliphate there. The Khan succeeded in 1258 and afterwards made Khajeh Nasir one of his personal advisors. 

Hulaku then made Azerbaijan the center of his huge state, which was known as Mongolian Ilkhanid Dynasty (Ilkhani means “People’s Khan” in Azerbaijani language). Maragheh, an ancient cultural center became the first capital that later was changed to Tabriz.

Hulaku Khan believed that much of his military successes were due to the advice of astronomers (who were also astrologers), especially of Khajeh Nasir al-Din al-Tusi. Khan’s advisor, Khajeh Nasir who was a scientist at the same time, benefited Hulaku’s belief in astrology and persuaded him to build an observatory in Maragheh. He convinced Hulaku that he could only guide the destiny of the Mongols if a huge observatory and a library to house enormous volumes of books were constructed. Furthermore, when Khajeh Nasir complained that his astronomical tables are outdated, Hulaku authorized building the observatory in a place of Khajeh Nasir’s choice. According to books such as Rashidi’s Jam-e-ttavarikhe, building of the Rasad Khaneh started in 1259 (657 A.H.). It became operational in 1262 and had various instruments, which was the invention of Khajeh Nasir himself. He also designed other instruments for the Observatory, which was far more than a center for astronomy. The library of the observatory contained 40,000 books on wide range of scientific topics in addition to astronomy and astrology, while work on mathematics and philosophy were vigorously followed there.

The idea of building Maragheh Observatory has its own specific story as was recorded by the well-known historian, Haji Khalifa, in his book, “A Book about the World”. When Khajeh Nasir proposed the idea of constructing an observatory that was an expensive undertaking as well, the Khan asked Khajeh Nasir, “…why do we need an observatory?” “…is the science about the stars so important that we should spend such a great amount of money?” Khajeh Nasir replied, “…allow me to carry out an experiment. Let’s arrange for someone secretly to go up this high hill and throw down a large empty caldron.” Khan accepted and so they did. When the caldron came down tumbling, it produced such a terrible noise that the Khan’s soldiers panicked. Khajeh Nasir then explained, “…we know the reason for all this clamor, that’s why, …and so it is, if we know the secrets of the celestial phenomena, we will be calm on the Earth.” Hulaku Khan then agreed and allocated 2,000 dinars for construction of an observatory, which would be the largest in the East. Construction began in 1259 and was carried out primarily by Mu’ayyid al-Din al-Urdi and his son, Mahmud. Such the wise and clear vision of Khajeh Nasir about the Universe and the importance of knowledge about it about 750 years ago is the indication of his obvious genius and sapience.

A number of other prominent astronomers worked with Khajeh Nasir there such as Muhyi al-Din al-Maghribi, Mu’ayyid al-Din al-Urdi from Damascus, Qutb al-Din al-Shirazi, and Hulaku’s Chinese astronomer Foal Munji whose Chinese astronomical experience brought improvements to Ptolemaic system used by Khajeh Nasir.

Khajeh Nasir invented a geometrical technique called as Tusi-couple for his planetary models, which generates linear motion from the sum of two circular motions. He also determined the precise value of 51 arc-second for the annual precession of the equinoxes and contributed to the construction and usage of some astronomical instruments including the astrolabe. After 12 years of intense work by Khajeh Nasir and other prominent scientists the observations and planetary models were compiled in the Zij-i Ilkhani, which clearly influenced Copernicus studies. The tables were published during the reign of Abaqa Khan, Hulaku’s son, and named after the founder of the observatory. The tables were commonly at use until the 15th century. It is not known definitely by when the Observatory had been active, however it is guessed to be active until about seven centuries ago. It was destroyed and turned into ruins because of frequent earthquakes and lack of state care and attention in different epochs. After suppressing the riot of Mokri Tribe supported by the Ottoman Sultan Morad III, Shah Abbas the Great arranged for repairing the Observatory, however, because of the king’s early death it was not commenced. The remnants of the Observatory inspired Ulugh Beg 172 years later to construct his observatory in Samarkand in 1428. Hulaku’s elder brother, Khublai Khan also constructed an observatory, the Gaocheng Astronomical Observatory, in China.

Maragheh Observatory had been the first largest center in the world before the use of telescope in astronomical studies. Observatories in Samarkand and India had been modeled upon Maragheh Observatory. It had been a treasury of archeology and science. The Observatory later provided a model for a similar building in Beijing. It was known to have housed an exceptionally large library and a school for training specialists. Khajeh Nasir collected famous scientists of the date to be involved with the construction of the instruments as well as actual observations. Many nationalities including Arabs, Azerbaijanis, Chinese, Georgians, Mongolians, Persians, Turks and also Jews were involved with the work of the Observatory. It is the mark of Khajeh Nasir’s high conceive about the vitality of implementing such the endeavor in global and multinational level. Khajeh Nasir was a man of exceptionally broad knowledge. He was born in 1201 in Tus at Khorasan Province near the city of Mashad, Iran (Persia at that time). He became quite influential in the Eastern cultures and science, and wrote more than 100 works in Persian and Arabic, then the language of Near Eastern science, however, Khajeh Nasir also wrote poems in Persian. Most of his works provide a well-consolidated account of what others had previously accomplished, many of which became the standard in a number of disciplines up until contemporary times. However, Khajeh Nasir made also substantial contribution to knowledge himself. Most of the researchers presently consider him basically a mathematician. His works played a great role in the development of geometry and trigonometry not only in the East but also in Europe. It was Khajeh Nasir who presented trigonometry as an individual science for the first time in the world. He also wrote on astronomy, physics, medicine, philosophy, ethics, and logic. He improved upon and revised earlier Arabic translations of Avicenna (Canon of Medicine), Euclid (Elements), Ptolemy (Almagest), Autolycus, Theodosius, Apollonius and others. It is worth to mention that Khajeh Nasir made the most significant development of Ptolemy’s model of the planetary system up to the development of the heliocentric model in the time of Copernicus, as mentioned in the Copernicus “De Revolutionibus”.

About 20 of his works make contributions to the fields of mathematics and astronomy. The most famous is “The Astronomic Tables of Ilkhans” in four volumes, which is a compilation of the research carried out at the Maragheh Observatory. His most popular book “Akhlagi Nasiri” dealt with ethics.

Khajeh Nasir demised on June 25, 1274, in Baghdad. The calligraphic inscription on his grave reads: “The helper of religion and people, the King of the country of Science-such a son had never been born before.”

In recent years it is paid large attention by the world community to commemoration and hail of Khajeh Nasir and Maragheh Observatory while the state is concerned to protect the remnants of the observatory. To save the remains of Maragheh observatory from further destruction, recently Iran’s Cultural Heritage and Tourism Organization (ICHTO) mounted a dome-framed shelter of brass over it that can be seen from remote distance. This structure protects the remnants from different risks such as seasonal and climate changes. The dome is also planed to hold an exhibit of astronomical devices used at Maragheh Observatory. Research Institute of Astronomy and Astrophysics of Maragheh (RIAAM) is the academic international institution responsible for reviving the glory of Maragheh Observatory.   


Further reading

  • Maragheh the biggest observatory of Middle Age

  • Maragheh: Heavens Gate  

  • Maragheh  




  1. Encyclopedia of Orient, © Copyright 1996-2005 LexicOrient
  2. The Columbia Electronic Encyclopedia, 6th ed. © Copyright 2005, Columbia University Press
  3. Encyclopedia of Britannica 2000
  5. Dr. Chingiz Qajar, Scientists Who Made A Difference, Nasir al-Din Tusi (1201-1274) and the Maragha Observatory,




Parviz Tarikhi is a space science and technology senior expert based in Iran. With background in Physics he presently heads Microwave Remote Sensing Department of Mahdasht Satellite Receiving Station. He particularly focuses on interferometry techniques in remote sensing and astronomy. In course of his cooperation with the United Nations Committee of Peaceful Uses of Outer Space (UN-COPUOS) since 2000, he worked as the Committee Bureau member in the capacity of Second Vice-Chairman and Rapporteur in 2004-06. He has co-chaired the Action Team number one of the Recommendations of UNISPACE-III aiming to “Develop a comprehensive worldwide environmental monitoring strategy” since 2001. He is at the same time a freelance journalist and scientific-technical writer for about 20 years. Write to him through his e-mail address at .







Maragheh, as seen from space

(images credit: Google Earth, image set-up: author)




Main street of Maragheh famous to Khajeh Nasir Street that still keeps its traditional form. There is a plan to build a modern street parallel to this street at the vicinity

(image credit: author)




Beautiful view of the lake behind Alavian Dam

(image credit: author)




Mehr Temple that belongs to the 7th Century B.C.




Remnants of Rasad Khaneh




Talebkhan village as seen from the site of Maragheh Observatory

(image credit: author)




The board introducing Maragheh Observatory at the entrance to the site

(image credit: author)



Close view of Maragheh Observatory


Maragheh Observatory Sketch; it was a four-story circular stone building of 28 m of diameter



Khajeh Nasir al-Din al-Tusi

(1201 – 1274 A.D.)



Khajeh Nasir’s geometrical technique called as Tusi-couple for his planetary models




An image from the book Zij-i Ilkhani written by Khajeh Nasir al-Din al-Tusi shows the Khajeh Nasir Tusi Group or Maragheh Observatory Group at work in the Observatory. The major members of the group headed by Khajeh Nasir were Mu’ayyid al-Din Orouzi, Fakher al-Din Maraghi, Fakher al-Din Ekhlati, Najm al-Din Dabiran.   



Maragheh Observatory over the Talebkhan Hill

(image credit: author)  



In front of the dome-framed shelter of brass over the remnants of Maragheh Observatory in summer 2007 in course of an exploratory visit to the Observatory; from left to right: my wife, a relative and I

(image credit: author)


Parviz Tarikhi

SPRING 2008-Parviz Tarikhi






Note: Apart from any fair dealing for the purposes of research or private study, or criticism or review, this publication may only be reproduced, stored or transmitted in any form or by any means with the prior permission in writing of the author.



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    سلام خسته نباشید وبلاگ زیبایی بود من ساکن روستای ورجوی در مراغه هستم حیفه که اصلان نامی از معبد مهر نیاوردین عکسای خوبی تو اینترنت موجود هست بهر حال اگه کاری داشتین بنده جهت همکاری در خدمتون هستیم

    • Parviz Tarikhi Says:

      دوست و همشهری گرامی آقای محمد صادقی،
      با سلام- مایه خوشحالی فراوان است که شما این سایت را ملاحظه کرده و آن را پسندیده اید. هرچند که سالها پیش در سن هجده سالگی برای تحصیلات عالیه مراغه را ترک کرده ام ولی علاقه و دلبستگی به زادگاهم را هرگز از دست نداده ام و هر از چندگاهی به آن دیار سفر می کنم و از بودن و به یاد آوردن ایامی که در آنجا گذرانده و رشد یافته ام سرخوش و شاد می گردم. البته اگر دقت فرمایید دراین مقاله در تصویر چهارم از بالا معبد مهر را ملاحظه خواهید کرد. این مقاله در اصل چند سال پیش به مناسب سال بین المللی خواجه نصیر طوسی (2008) برای چاپ در یک نشریه خارجی توسط من تهیه شده بود و اگر علاقه مند باشید می توانید آن را در آدرس زیر ملاحظه فرمایید.
      راستش را بخواهید عظمت و اهمیت مراغه و رصذخانه آن و بنیانگذلرش خواجه نصیر طوسی و خردمندی او را در طول سالها کار و فعالیت و تحقیق علمی و بین المللیم از زبان خارجیها خیلی خیلی بیشتر از ایرانیها دیده و شنیدم و این مرا غرق در غرور و افتخار می سازد. من همواره تلاش می کنم تا با انتشار مطالب و واقعیتهایی در باره ارزش و اعتبار زادگاهم دین خود را ولو اندکی ادا کنم. باشد که همه ما اهالی این زادو بوم پر آوازه و مهم از نظرگاه تحول علمی و تمدن بشری ذر مقیاس جهانی با تلاش جمعی و فردی خود در بازتاب بزرگی آن سهمی در خور داشته باشیم. من نیز به نوبه خود خیلی از داشتن دوست علاقه مندی چون شما جهت همکاری و همفکری برای اعتلای زادگاهمان خوشحال خواهم شد. لطفا در این باره و نظرات خود در این صفحه یا از طریق آدرس الکترونیکیم
      با من تماس بگیرید.
      با تشکر فراوان

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