Sex"tant(?), n. [L. sextans, -antis, the sixth part of an as, fr. sextus sixth, sex six. See Six.] 1. (Math.) The sixth part of a circle.
2. An instrument for measuring angular distances between objects, -- used esp. at sea, for ascertaining the latitude and longitude. It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of a circle. See Quadrant.
(Astron.) The constellation Sextans.
Box sextant, a small sextant inclosed in a cylindrical case to make it more portable.
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