- sextant - a unit of angular distance equal to 60 degrees
--1 is a kind of angular unit
--1 is a part of circumference
--1 has parts: degree, arcdegree- sextant - a measuring instrument for measuring the angular distance between celestial objects; resembles an octant
--2 is a kind of measuring instrument, measuring system, measuring device
--2 has part: limb
--2 has particulars: astrolabe - sextant - a measuring instrument for measuring the angular distance between celestial objects; resembles an octant