cross-staff ( synonym found)
Definition of cross-staff:

(n) : an early navigational instrument, consisting of a wooden rod with a sliding crosspiece, used for measuring the altitude of a star; it developed into the sextant
Definition of cross-staff:

(n) : an early navigational instrument, consisting of a wooden rod with a sliding crosspiece, used for measuring the altitude of a star; it developed into the sextant
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