A sextant is an instrument used for measuring angles, for example between the sun and the horizon, so that the position of a ship or aeroplane can be calculated.
英汉词典释义
n.
(航海用的)六分仪
the principle of the sextant六分仪的基础
英英词典释义
Noun
1. a unit of angular distance equal to 60 degrees
2. a measuring instrument for measuring the angular distance between celestial objects; resembles an octant