Octant is a measuring instrument similar to a sextant. Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea In physics and engineering, measurement is the activity of comparing physical quantities of real-world objects and events. ... A sextant is a measuring instrument used to measure the angle of elevation of a celestial object above the horizon. ...
See also: Octant. Can refer to a region of Euclidean 3-space with a specific sign for x, y and z coordinates. ...
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