#parallel_of_latitude__latitude__line_of_latitude__parallel  an imaginary line around the Earth parallel to the equator
  supertype:  #line.location  a spatial location defined by a real or imaginary unidimensional extent
  subtype:  #polar_circle__polarcircle  a line of latitude at the north or south poles
     instance:  #Antarctic_Circle  #Arctic_Circle
  subtype:  #horse_latitude__horselatitude  either of two belts or regions near 30 degrees north or 30 degrees south; characterized by calms and light baffling winds
  subtype:  #tropic  either of two parallels of latitude about 23.5 degrees north and south of the equator representing the points farthest north and south at which the sun can shine directly overhead and constituting the boundaries of the torrid zone or tropics
     instance:  #Tropic_of_Cancer  #Tropic_of_Capricorn

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