Then
Maragha became a model of institutional astronomy and his tables guided calendars and navigation for the region.
Timeline of Discovery · 9 / 30
Nasir al-Din al-Tusi
c. 1201 - 1274 · Islamic Golden Age (Persia / Mongol Ilkhanate)
Nasir al-Din al-Tusi was a polymath astronomer and mathematician who built a leading observatory and refined planetary models later echoed in Europe.
- Astronomy
- Mathematics
- Islamic Golden Age
Lived
c. 1201 - 1274
Era
Islamic Golden Age
Primary field
Astronomy
Signature idea
Refined planetary models later echoed by Copernicus
Their place in history
c. 1201 - 1274
The question they asked
How can the observed motions of planets be reproduced with mathematics, without the awkward errors of Ptolemy’s models?
The Contribution
What this scientist actually did — precisely and plainly.
At the Maragha observatory he compiled star tables and devised geometric devices (such as the Tusi couple) that smoothed planetary motion into more accurate circular combinations.
How the Work Advanced Knowledge
The tools, experiments and reasoning behind the discovery.
He organised high-precision observations, tables and competing scholars at one observatory, then translated observations into refined geometric models.
Why It Mattered Then / Today
From their own moment in history to the world we live in now.
Today
His geometric “couple” inspired later Copernican models, and his observatory culture previews modern research institutes and shared data.
Important Works or Discoveries
Landmarks that carried the idea into the world.
- Zij-i Ilkhani (star tables)
- Tusi couple mechanical–geometric device
- Commentaries on Euclid and Ptolemy
Sources
Where this profile was verified.
Last reviewed: 2026-09-22
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