Bible Dictionaries
Backstaff
Webster's Dictionary
(n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; - so called because the observer turned his back to the body observed.
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Bibliography Information
Webster, Noah. Entry for 'Backstaff'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/b/backstaff.html. 1828.