Then
His measured Earth radius and astronomical tables improved maps and calendars across the region and were cited for centuries.
Timeline of Discovery · 6 / 30
Al-Biruni
c. 973 - 1048 · Islamic Golden Age (Khwarezm / Ghazni)
Al-Biruni was a scholar of staggering range — mathematics, astronomy, geography, physics and history — who measured the Earth and insisted on careful empirical corroboration.
- Astronomy
- Mathematics
- Islamic Golden Age
Lived
c. 973 - 1048
Era
Islamic Golden Age
Primary field
Astronomy
Signature idea
Measured the Earth; wrote encyclopaedically across the sciences
Their place in history
c. 973 - 1048
The question they asked
How big is the Earth, and how can we understand other peoples and their sciences without prejudice?
The Contribution
What this scientist actually did — precisely and plainly.
He calculated the Earth’s radius with remarkable accuracy, wrote encyclopedic geographic studies, and described India’s science and culture with unusual fairness.
How the Work Advanced Knowledge
The tools, experiments and reasoning behind the discovery.
He combined precise instruments, trigonometry and repeated observations, and he cross-checked facts across multiple sources before accepting them.
Why It Mattered Then / Today
From their own moment in history to the world we live in now.
Today
Geodesy (measuring the Earth), cautious data verification and respectful cross-cultural scholarship all reflect his standards.
Important Works or Discoveries
Landmarks that carried the idea into the world.
- The Determination of the Coordinates of Cities
- Kitab al-Hind (Book of India)
- Masudic Canon of astronomy
Sources
Where this profile was verified.
Last reviewed: 2026-09-22
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