The astrolabe (Ancient Greek: ἀστρολάβος astrolabos; Arabic: ٱلأَسْطُرلاب al-Asturlāb; Persian: ستاره‌یاب Setāreyāb) is an ancient astronomical instrument that is a hand-held model of the universe. Its various functions make it an elaborate inclinometer and an analog computing device capable of solving various kinds of problems in astronomy. In its simplest form, it is a metal disk with a pattern of wires, cuts, and holes that allows a user to precisely calculate astronomical positions. Historically used by astronomers, it can measure the height above the horizon of a celestial body, day or night; It can be used to identify stars or planets, determine local latitude relative to local time (and vice versa), survey or triangulate. In classical antiquity, in the Islamic Golden Age, The importance of the astrolabe derives not only from early developments in the study of astronomy,[1] it is also effective for determining latitude on land or in calm seas. Although less reliable on the deck of a ship in rough seas, the sailor's astrolabe was developed to solve this problem.