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Definition of Backstaff
1. n. An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed.
Definition of Backstaff
1. Noun. (nautical) An early navigational instrument for measuring the altitude of the sun and hence calculating latitude ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Backstaff
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