astrolabe
astronomical instrument in the form of a disc or sphere with wires, cutouts or perforations that allows a user to calculate astronomical positions precisely
en-US/ˈæstɹəˌleɪb/
en-GB/ˈæstɹəleɪb/
astronomical instrument in the form of a disc or sphere with wires, cutouts or perforations that allows a user to calculate astronomical positions precisely