- A navigational instrument containing a graduated 60-degree arc, used for measuring the altitudes of celestial bodies for use in determining the latitude and longitude of the observer.
- In <em>mathematics</em>, the sixth part of a circle. Hence An important instrument of navigation and surveying, for measuring the angular distance of two stars or other objects, or the altitude of a star above the horizon, the two images being brought into coincidence by reflection from the transmitting horizon-glass, lettered <em>b</em> in the figure.
- [<em>capitalized</em>] Same as <internalXref urlencoded="Sextans">Sextans</internalXref>, 2.
- The sixth part of a circle.
- 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 <er>Quadrant</er>.
- The constellation Sextans.
- a small sextant inclosed in a cylindrical case to make it more portable.
- A <xref>navigational</xref> device for deriving angular distances between objects so as to determine <xref>latitude</xref> and <xref>longitude</xref>.
- One <xref>sixth</xref> of a <xref>circle</xref> or <xref>disc</xref>; a <xref>sector</xref> with an <xref>angle</xref> of 60°.
- a measuring instrument for measuring the angular distance between celestial objects; resembles an octant
- a unit of angular distance equal to 60 degrees