Latest / The Story of Uzbekistan: Silk Road Kingdoms and Soviet Legacy — Fexingo History / Ulugh Beg's Observatory: The Sultan Who Measured the Stars
Transcript
- Lucas: We've talked a lot about Timur's empire, his conquests, his monumental architecture. But his grandson, Ulugh Beg, took the dynasty in a completely different direction — not swords, but sextants. Not palaces, but a giant observatory in Samarkand. Luna: I've seen photos of the ruins — a curved trench in the ground. Doesn't look like much, but I know it was huge. Lucas: It was enormous. The main instrument was a massive sextant — actually one-sixth of a circle — carved into a trench in a hillside. It had a radius of about forty meters. That's bigger than most modern telescopes. And it was used to track the stars with an accuracy that wouldn't be matched in Europe for centuries. Luna: Forty meters. So they literally built a giant stone protractor into the ground. Lucas: Exactly. It was called the Fakhri sextant. Observers would climb down into the trench and read measurements off a marble scale. They could determine the position of stars, the sun, the moon — even the length of the solar year to within a few minutes. Lucas: But this wasn't just a personal hobby. Ulugh Beg assembled a team of the best mathematicians and astronomers of the Islamic world. Names like Al-Kashi, who calculated pi to sixteen decimal places, and Ali Qushji, who later took the knowledge to the Ottoman Empire. Luna: So this was a real research institute. Did they produce something like a star catalogue? Lucas: They did. The Zij-i Sultani — a star catalogue containing the positions of over a thousand stars. It was the most precise of its time, correcting errors in Ptolemy and the earlier Islamic tables. For example, Ulugh Beg calculated the length of the sidereal year as 365 days, 6 hours, 10 minutes and 8 seconds — that's only about a minute off the modern value. Lucas: And that's where I want to mention something. If you've been stepping into history with us episode by episode, you might have noticed these shows take a lot of research and time. We keep them ad-free, and that's only possible because a handful of listeners chip in through buy me a coffee dot com slash fexingo. It's not a big thing — just people who like what we do and want to keep it going. So if you're one of them, thank you, really. Luna: Yeah, it's a small group that makes this possible. And it means we can spend time on stories like this — the deep cuts. Lucas: Right. So back to Ulugh Beg. He wasn't just an astronomer — he was also the ruler of Samarkand. But he was more interested in the stars than in politics. He neglected military campaigns and administration. Religious conservatives, led by the Sufi sheikh Khwaja Ahrar, saw his science as impious. Luna: Because astronomy involves predicting celestial events — did they see that as claiming divine knowledge? Lucas: Partly. But also, Ulugh Beg's father, Shah Rukh, had moved the Timurid capital to Herat, and Ulugh Beg was seen as weak and distracted. His own son, Abd al-Latif, eventually turned against him. In 1449, Ulugh Beg was assassinated on the order of his son — a truly Shakespearean betrayal. Luna: His own son. Did the observatory survive? Lucas: It was abandoned and fell into ruin. The instruments were destroyed or buried. The site was lost for centuries, until a Russian archaeologist, Vasily Vyatkin, rediscovered the trench in 1908. He dug through local legends about a 'stone book' and found the sextant arc. Luna: So for almost five hundred years, that giant instrument was just buried under Samarkand. Lucas: And it's remarkable that the catalogue survived. Manuscript copies were made and spread across the Islamic world and into Europe. Copernicus actually cited Ulugh Beg's observations in his own work. So the science outlived the man and the instrument. Lucas: There's also a personal detail I love. Ulugh Beg's cousin was Babur, the founder of the Mughal Empire. In his memoirs, the Baburnama, Babur visits the observatory and describes it: 'The building is three stories high, and on top is a platform where the instruments are kept.' He admired it, even though by then it was already decaying. Luna: So the Mughals knew about this place. It connects two worlds. Lucas: Exactly. And that's the story of Central Asia — these threads of science, conquest, and religion, all tangled together. Ulugh Beg's observatory is a monument to what happens when a ruler puts knowledge above power. But it's also a cautionary tale: neglect the politics, and the politics will destroy you. Luna: It makes you wonder what else might be buried under Samarkand. Lucas: There's plenty. The whole city is layered — Greek, Persian, Turkic, Mongol, Timurid. Every dig turns up something. But the observatory is special. It's a reminder that the Silk Road wasn't just about trade; it was about ideas. And some of those ideas were so ahead of their time that they took centuries to catch up.