Crossword Genius

Instrument formerly used to measure the altitude of stars and planets and as a navigational aid (9)

Ross

I believe the answer is:

astrolabe

(Other definitions for astrolabe that I've seen before include "Astronomical instrument of former times" , "navigational aid" , "Old navigation instrument" , "Navigational device" , "heavenly model" .)

I've seen this clue in The Independent.
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