Hemisferium Eastern AstrolabeThis planisferic astrolabe was developed after the one made by Diyaal Din Muhammad (Lahore, 1647). The original piece can be found at the Adler Planetarium & Astronomy Museum in Chicago. The stars on its rete and all other calculus have been updated to make it functional today. It is set for latitude 22 (Mecca). Astrolabe, from the Greek, star searcher, was introduced to Europe by the Arabs in the early 12th century. It became a vital tool for