Planispheric Astrolabe. Dimensions: H. 8 1/2 in. (21.6 cm) W. 6 3/4 in. (17.1 cm) D. 2 1/4 in. (5.7 cm). Maker: Muhammad Zaman al-Munajjim al-Asturlabi (active 1643-89). Date: dated A.H. 1065/ A.D. 1654-55. Astrolabes of this size were not precise en