Note 58 — Chapter III · Globes Constructed by the Arabs
Reading edition
Lelewel, J. Géographie du moyen âge. Bruxelles, 1857. Vol. I, p. 116; Jourdain. Mémoire sur l’observatoire de Méragah. Paris, 1810. It is well known that under the direction of Nasr-Eddin, who was called to the charge of this observatory by Hulagu Khan, astronomical instruments were constructed.