Latest / Timbuktu: Africa's Forgotten Center of Knowledge — Fexingo History / The Timbuktu Astrolabe That Measured the Stars
Transcript
- Lucas: So, we've talked a lot about Timbuktu's scholars and their manuscripts — law, medicine, poetry, geography. But there's one tool that really shows how connected they were to the wider Islamic world: the astrolabe. Luna: An astrolabe? Like the brass thing with all the circles and pointers? Lucas: Exactly. It's basically a handheld computer of the medieval world. You could use it to tell time, find the direction of Mecca, calculate the position of stars, even predict eclipses. And it turns out Timbuktu had some really beautiful ones. Lucas: There's a particular astrolabe that survives in the Fondo Kati collection. It's made of brass, inscribed with Arabic script, and it was likely made in Andalusia — probably Cordoba or Toledo — in the 13th or 14th century. Then it somehow made its way across the Sahara to Timbuktu. Luna: How did it get there? Trade? Lucas: Most likely through the trans-Saharan trade routes. We know from the Tarikh al-Sudan that scholars traveling to and from Mecca would bring back books and instruments. But also, there were direct connections with the Maghreb and Muslim Spain. The astrolabe might have been a gift, or part of a scholar's personal library. Lucas: What's remarkable is that the scholars of Timbuktu didn't just collect these instruments — they used them. We have records from Ahmad al-Wangari, who taught at Sankore Madrasa in the 15th century, that he wrote commentaries on astronomical tables. He used the Zij al-Sindhind, which were Indian-derived star tables adapted by Islamic astronomers. Luna: So they were actively doing astronomy, not just preserving books. Lucas: Exactly. They had to. The Sahel has a very distinct sky — the dry season means crystal-clear nights for months. And for a society that relied on camel caravans crossing the Sahara, knowing the stars wasn't just academic. It was survival. The Tuareg, for example, navigated by the stars using a system of lunar mansions called manazil al-qamar. Lucas: The manazil al-qamar divides the sky into 28 segments based on the moon's daily movement. Each mansion has a name and a set of stars associated with it. This system was used across the Islamic world, but in the Sahel, it was adapted for local conditions. For instance, the rising of certain stars marked the start of the rainy season or the best time to plant millet. Luna: So astronomy was tied to agriculture and travel. Lucas: Absolutely. And there's evidence that Timbuktu scholars made their own observations. We have a manuscript from the Fondo Kati that records an eclipse in 1494. The writer notes the exact time and the position of Jupiter and Venus. That's not just copying from a table — someone was watching the sky. Lucas: One of the most famous astronomers referenced in Timbuktu manuscripts is al-Battani, a 9th-century Syrian scholar. His star catalog was standard. But also al-Suyuti, the Egyptian polymath, wrote about astronomy in a more popular style. His works were widely copied in Timbuktu. Luna: Were there any Timbuktu-specific innovations? Lucas: That's a great question. Some historians argue that Sahelian astronomers adapted the gnomon — a simple stick used to measure the sun's shadow — to determine the solstice with surprising accuracy. There's a manuscript that describes using a gnomon in the middle of the Sahara, near Taghaza, to calculate the latitude. That's practical navigation. Lucas: But we have to be careful. A lot of the astronomical manuscripts from Timbuktu haven't been fully studied. The ones that survived are often in poor condition, and many are still in private collections. So we may be underestimating what they achieved. Luna: It's like a lost science. Lucas: Exactly. And the astrolabe is a symbol of that. When the Saadian invasion came in 1591, many scholars fled with their books and instruments. The astrolabe we have might have been hidden for centuries. It's a miracle it survived at all. Lucas: Speaking of survival — if you've been stepping into history with us, episode by episode, you've probably wondered how we keep this show ad-free and independent. It's because of listeners like you. Luna: Yeah, it's a small thing, but a coffee's worth of support really does make a difference. Lucas: If this episode was worth a coffee to you, there's a link — buy me a coffee dot com slash fexingo. That's all it takes to keep the conversations going. Luna: Right. And speaking of going — I wonder if any of those Timbuktu astronomers ever saw a comet and recorded it. Lucas: Actually, there's a manuscript from the 16th century that mentions 'a star with a tail' appearing in 1532. It might have been Halley's Comet. But the text is damaged, so we're not sure. Which is exactly why preserving these manuscripts is so important. Lucas: So next time you look up at the night sky, remember that in Timbuktu, someone was doing the same thing — with a brass astrolabe in hand, mapping the stars that guided caravans, marked the seasons, and connected them to a universe of knowledge.