Origin from 1259
The Maragheh Observatory was built in 1259 in northwestern Iran under the patronage of the Mongol Ilkhanid ruler Hulagu and directed by the Persian polymath Nasir al-Din al-Tusi, who had persuaded Hulagu that his astronomical tables needed a purpose-built institution. It was financed through waqf, the Islamic charitable endowment, which let it keep operating for more than fifty years after Tusi's death, and its scholars produced the Zij-i Ilkhani astronomical tables and mathematical innovations later used by Ibn al-Shatir and, some historians argue, transmitted onward to Copernicus.
Facts
Organisation
Distinguishing FeatureSourced to the subject's own accountFounded because Nasir al-Din al-Tusi persuaded the Ilkhanid ruler Hulagu that his astronomical tables needed a purpose-built institution rather than being compiled without one. 1 Governing BodySourced to the subject's own accountDirected by the astronomer Nasir al-Din al-Tusi; supervised by his son after Tusi's death in 1274. 1 Classification
ActivitySourced to the subject's own accountResearch and Scholarship 1 Origins
Origin PeriodSourced to the subject's own account FounderSourced to the subject's own accountAstronomer Nasir al-Din al-Tusi, who built the observatory under the patronage of the Ilkhanid ruler Hulagu Khan. 1Tradition: Maragheh Observatory (Wikipedia) FoundedBuilt 1259 under the Ilkhanid Hulagu, directed by Nasir al-Din al-Tusi 2 History
Historical NoteSourced to the subject's own accountHoused a library reported to have held around 400,000 volumes, and served as a model for the later Ulugh Beg Observatory at Samarkand. 1 Status
Legal StatusSourced to the subject's own accountFinanced through waqf, the Islamic charitable endowment, which let the observatory keep operating for more than fifty years after Tusi's death in 1274. 1 Current StatusSourced to the subject's own accountHistorical site; the observatory fell out of active use by the end of the 13th century and survives today as ruins. 1 Publications
Notable PublicationThe Zij-i Ilkhani, astronomical tables compiled by the observatory's scholars, whose mathematical innovations were later used by Ibn al-Shatir and, some historians argue, transmitted onward to Nicolaus Copernicus. 2 Learn More
Tusi Persuades Hulagu, and the Zij-i Ilkhani Follows
This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
The Maragheh Observatory was built in 1259 in northwestern Iran under the patronage of the Mongol Ilkhanid ruler Hulagu and directed by the Persian polymath Nasir al-Din al-Tusi, who had persuaded Hulagu that his astronomical tables needed a purpose built institution rather than being compiled without one. The observatory drew astronomers from across the Islamic world and beyond, gathering the instruments, library and working scholarly community a project of that scale required in a single location for the first time in the region.
Its scholars produced the Zij-i Ilkhani, an astronomical tables compilation whose mathematical innovations were later used by the astronomer Ibn al-Shatir and, some historians argue, transmitted onward to Nicolaus Copernicus, making Maragheh's own working methods part of a chain of influence some scholars trace directly into the European Copernican revolution nearly three centuries later. That claimed transmission remains debated among historians of science, but the observatory's own technical output, the Zij-i Ilkhani itself, is not in dispute, and the tables were consulted by astronomers across the Islamic world for generations after they were first compiled at Maragheh under Tusi's own direction.
Funded by Waqf, Outlasting Its Founder by Fifty Years
This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
The Maragheh Observatory was financed through waqf, the Islamic charitable endowment, an arrangement that let it keep operating for more than fifty years after Tusi's own death in 1274, well beyond the working life of any single patron or director. Tusi's son supervised the observatory in that period, continuing the institution his father had built rather than letting it lapse the moment its founding astronomer was no longer there to direct it personally.
The observatory nonetheless fell out of active use by the end of the thirteenth century, and it survives today only as ruins, a site whose scholarly output outlasted the physical institution that produced it by many centuries. Whatever administrative or political changes ended its working life, the mathematical tables its astronomers compiled under Tusi's direction continued circulating and being used long after the instruments that produced them had fallen silent and the buildings that housed them had begun to fall into ruin.
The waqf endowment structure itself is worth naming as a deliberate institutional choice rather than an incidental funding detail: by tying the observatory's upkeep to a charitable endowment rather than to the ongoing goodwill of a single ruling patron, Tusi and Hulagu built in a source of continuity that let the observatory's work outlast both of their own lifetimes, even though it could not, in the end, outlast the political and administrative changes that eventually let the institution itself lapse.
Connections
Associated With
This source names Iran directly: "was built in 1259 in northwestern Iran under the patronage of the Mongol Ilkhanid ruler Hulagu and directed by the Persian polymath Nasir al-Din al-Tusi, who had persuaded Hulagu that his..."
Source Encyclopaedia Britannica (online academic reference)Encyclopaedia Britannica editors
Source Encyclopaedia Britannica (online academic reference)Encyclopaedia Britannica editors
This source names Maragheh Observatory directly: "general-reference article on the Maragheh observatory, a continuously edited tertiary source with no fixed publication year, accessed 2026-08-14."
Source Maragheh Observatory (Wikipedia)Wikipedia contributors
This source names Mongols directly: "The Maragheh Observatory was built in 1259 in northwestern Iran under the patronage of the Mongol Ilkhanid ruler Hulagu and directed by the Persian polymath Nasir al-Din al-Tusi, who had persuaded..."
Source Encyclopaedia Britannica (online academic reference)Encyclopaedia Britannica editors
This source names Persians directly: "The Maragheh Observatory was built in 1259 in northwestern Iran under the patronage of the Mongol Ilkhanid ruler Hulagu and directed by the Persian polymath Nasir al-Din al-Tusi, who had persuaded..."
Source Encyclopaedia Britannica (online academic reference)Encyclopaedia Britannica editors
Related To
Sources
1. Maragheh Observatory (Wikipedia)
Wikipedia contributors, WikipediaIntroduction identifying it as n astronomical observatory established in the mid 13th century under the patronage of the Ilkhanid Hulagu and the directorship of Nasir al-D
The Maragheh observatory (Persian: رصدخانه مراغه), also spelled Maragha, Maragah, Marageh, and Maraga, was an astronomical observatory established in the mid 13th century under the patronage of the Ilkhanid Hulagu and the directorship of Nasir al-Din al-Tusi, a Persian scientist and astronomer.
Introduction, activity
was an astronomical observatory established in the mid 13th century under the patronage of the Ilkhanid Hulagu and the directorship of Nasir al-Din al-Tusi, a Persian scientist and astronomer.
View the Source 2. Encyclopaedia Britannica (online academic reference)
Encyclopaedia Britannica editors, Encyclopaedia Britannica, Inc., 2024s.v. Maragheh Observatory, Nasir al-Din al-TusiView the Source Reader Challenges (0)
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