An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed.
An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed.
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the heavenly bodies, but now superseded by the quadrant and sextant; --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.
Backstaff
An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed.
Usage Examples
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