Just one object to finish. This is not an astrolabe, even if its spherical and intersected by a moveable pointer, an alidade. This is a mathematical representation of the Muslim world to identify the great cities and to define one’s position to Mecca. Mecca is in the center, and the positions of the hundred and fifty cities are indicated by their coordinates. By moving the alidade one can determine for each city the direction and distance of Mecca, thanks to the scale around the central piece. A compass was also added at the bottom of the object. The instrument is based on the astronomical tables compiled from the observations of Ulugh Beg in Samarkand. Of this map – since this object is a veritable map – there exist only two copies, the first discovered in 1989 and the second in 1995.