#sextant.angular_unit  a unit of angular distance equal to 60 degrees
  supertype:  #angular_unit__angularunit  a unit of measurement for angles
  part of:  #circumference
  part:  #arcdegree__degree  a measure for arcs and angles; "there are 360 degrees in a circle"
     part:  #minute_of_arc__minute__arcminute  a unit of angular distance equal to a 60th of a degree
        part:  #arcsecond__second  a 60th part of a minute of arc; "the treasure is 2 minutes and 45 seconds south of here"

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