名詞 sextant:

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

1. A medieval instrument, now replaced by the sextant, that was once used to determine the altitude of the sun or other celestial bodies.
   星盤一種中世紀的儀器，曾用來測量太陽或其它天體的高度，現(xiàn)在已被六分儀取代