sextant

Noun
  1. A unit of angular distance equal to 60 degrees (synset 113633793)
    is a type of: angular unit - a unit of measurement for angles
    has: arcdegree, degree - a measure for arcs and angles
    is a part of: circumference - the length of the closed curve of a circle
  2. A measuring instrument for measuring the angular distance between celestial objects;
    Resembles an octant (synset 104187949)
    is a type of: measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
    subtypes: astrolabe - an early form of sextant
    has: limb - the graduated arc that is attached to an instrument for measuring angles

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