Believed to be the oldest arab celestial globe in the world. Only the globe is original; the base with the horizon and the meridian are more recent. An Arabic inscription states that the globe was made in Valencia by Ibrâhim 'Ibn Saîd and his son Muhammad in year 478 of the Hegira (1085 of the Christian era). The instrument was acquired and studied in the second half of the nineteenth century by Ferdinando Meucci, director of the Museo di Fisica e Storia Naturale of Florence.