![Al-Ma'mun at the first degree measurment.(German: Der Kalif Mamun veranstaltet die erste Gradmessung).Caliph Al-Ma'mun/Almamon/ Al-Maymun/ el-Mâmoûn- Abbasid caliph (813-833).Liebig card, Episodes from the Caliphate, 1897. (Photo by Culture Club/Getty Images) *** Local Caption ***](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/ZOUHRY5YKYGTQ2Y34MW4346UAM.jpg?smart=true&auth=40c74efdc87f73a13d42996d80b2037228c7aeb95a60f70f70d13700057bf716&width=400&height=225)
Al Mamun at the first degree measurement. (813-833). Culture Club / Getty
Al Mamun at the first degree measurement. (813-833). Culture Club / Getty
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