The sacred city
A plate from an astrolabe in the 'chronology' section. It is inscribed 'Mecca, Allah protect her, and Yamama. Latitude 21°40'; hours 13h33m', and has lines for finding the times of prayer. An indication of the astrolabe's existence within a shared Christian and Muslim culture is the zodiacal calendar on the back, where the names of the Christian months are given both in Arabic transliteration and in Latin.
Astrolabe plate, by Ibrahim ibn Sa'id al-Sahli, Toledo, 1068 (Inv. 55331)