Latest / Timbuktu: Africa's Forgotten Center of Knowledge — Fexingo History / The Timbuktu Scholar Who Decoded the Stars: Al-Wangari's Lost Astronomy
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- Lucas: So, we've talked a lot about Timbuktu's scholars — the jurists, the historians, the poets. But one figure we've only touched on is Muhammad al-Mustafa al-Wangari. He was an astronomer, and his work is genuinely mind-bending for the 17th century. Luna: I remember the name from the episode on the qibla calculations. He wrote something called the 'Mirror of the Universe,' right? Lucas: Exactly. Mīr'āt al-Ālam. It's a comprehensive treatise on astronomy, and it survives in a single manuscript at the Mamma Haidara Library. Al-Wangari wasn't just copying earlier works; he was actively calculating and correcting. Lucas: He lived in the 1600s, a generation or two after the Saadian invasion. So Timbuktu's scholarly community was battered but still alive. Sankore was still functioning, and al-Wangari was trained there in the Maliki tradition, but he also had a deep interest in ilm al-falak — the science of the stars. Lucas: What's remarkable is that he had access to the works of al-Zarqali from 11th-century Andalusia, and al-Battani from 9th-century Harran. He used their tables but also adapted them to Timbuktu's latitude. Luna: So he was doing local astronomy, not just reciting old formulas. Lucas: Exactly. One of the key problems he tackled was determining the qibla — the direction of Mecca — from Timbuktu. That's not trivial. The common method in West Africa was to face east, but that's wrong for Timbuktu, which is actually northeast of Mecca. Al-Wangari used spherical trigonometry to calculate the correct bearing. Lucas: In his manuscript, he includes diagrams of astrolabes and quadrants. He describes how to build them and use them. And he gives specific values for the altitude of the sun at different times of year, which he measured himself. Luna: He was making his own observations? That's incredible. Lucas: He was. And he wasn't alone. Timbuktu had a tradition of observational astronomy going back centuries. There's evidence that scholars at Sankore built a rudimentary observatory — nothing like the grand ones in Maragheh or Samarkand, but functional. They tracked lunar phases, solstices, and equinoxes. Lucas: Al-Wangari's work also engages with the debate about the precession of the equinoxes. The classical value from Ptolemy was about 1 degree per 100 years. Al-Wangari, citing al-Zarqali, noted that the actual rate was closer to 1 degree per 66 years. That's astonishingly close to the modern value of about 71.6 years. Luna: Wait — a 17th-century scholar in Timbuktu was correcting Ptolemy? How did he even know about that debate? Lucas: Because the intellectual networks of the Islamic world were still alive. Manuscripts from Cairo, Fez, and even India made their way to Timbuktu via the trans-Saharan trade. Al-Wangari likely had access to the works of Nasir al-Din al-Tusi and the Maragheh school. So he was plugged into a global conversation. Lucas: But here's the thing — his manuscript is not a copy of someone else's work. It's a synthesis. He takes the best data available, checks it against his own observations, and sometimes disagrees. For example, he recalculated the obliquity of the ecliptic — the tilt of the Earth's axis — and got a value of 23 degrees and 31 minutes. That's within a few arcminutes of the correct value for his era. Luna: That's precision that wouldn't be matched in Europe for another century or so. Lucas: Right. And he did it with an astrolabe he probably built himself. The manuscript includes instructions for constructing the instrument, with specific dimensions and markings. It's a practical manual as much as a theoretical treatise. Lucas: Now, why don't we know about this? Partly because the manuscript was only rediscovered in the 20th century. It was cataloged by the Mamma Haidara family, and then during the jihadist occupation of 2012–2013, it was smuggled out to Bamako along with thousands of others. It survived. Luna: So it's still intact? We can read it today? Lucas: Yes. It's been digitized. Scholars like Dr. Shamil Jeppie at the University of Cape Town have studied it. But there's still so much we don't know. Who exactly was al-Wangari? What was his family background? How did he fund his research? We know he was a qadi — a judge — so astronomy was his side passion. Lucas: And that's a theme we've seen before: Timbuktu's scholars were polymaths. They were jurists, historians, and scientists all at once. Al-Wangari's Mīr'āt al-Ālam is proof that the intellectual fire didn't go out after the Saadian invasion. It flickered, but it kept burning. Luna: It makes you wonder what else is hidden in those libraries. Lucas: Exactly. And that's part of why we keep making these episodes — to bring those stories to light. We don't run ads on Fexingo History, and we never will. It's a deliberate choice. If you value this kind of deep dive into overlooked histories, you can support the show at buy me a coffee dot com slash fexingo. Every contribution keeps us ad-free and independent. Luna: Yeah, it's a small way to help us keep digging into archives and manuscripts like al-Wangari's. Lucas: So, back to the science. One of the most fascinating parts of Mīr'āt al-Ālam is his discussion of the visibility of the lunar crescent. That's crucial for the Islamic calendar, and he gives precise conditions for when the new moon should be sighted — based on the angular distance from the sun and the altitude at sunset. Luna: He was essentially solving a practical problem for the entire community. Lucas: Yes. And his method was more accurate than the simple rule of thumb used by most jurists. He even criticizes earlier scholars who relied on tradition rather than calculation. That took courage. Lucas: There's also a section where he tackles the question of whether the Earth rotates. He cites the arguments of al-Biruni and others, but he doesn't commit. He says, 'Only God knows the truth.' That's typical for the time — you could discuss heliocentrism as a hypothesis, but you wouldn't necessarily endorse it. Luna: So he was aware of the debate about a rotating Earth, centuries before Galileo. Lucas: Exactly. The Islamic world had been debating that since the 11th century. Al-Wangari was part of that long conversation. And his work shows that Timbuktu was not a backwater — it was a node in a global network of knowledge. Lucas: I think the takeaway is that we need to revise our mental map of who was doing science in the 1600s. It wasn't just Europe and the Ottoman Empire. It was also the Sahel. Luna: And thanks to manuscripts like al-Wangari's, we can start to piece that picture together. Lucas: Right. So next time you look up at the stars, remember that someone in Timbuktu was measuring them with just an astrolabe and a lot of patience.