astrolabe
/ˈæstrəʊleɪb/noun
- chiefly historical an instrument used to make astronomical measurements, typically of the altitudes of celestial bodies, and in navigation for calculating latitude, before the development of the sextant. In its basic form it consists of a disc with the edge marked in degrees and a pivoted pointer.〈主史〉星盘（六分仪发明前用于测量天体高度及航海时测量纬度的仪器）。
词源
late Middle English: from Old French astrelabe, from medieval Latin astrolabium, from Greek astrolabon, neuter of astrolabos 'star-taking'.