[ $ "bigrat.qky" loadfile ] now!

  [ v- -v
    proper rot
    360 mod
    unrot improper
    180 1 2over v< iff
      [ 360 1 v- ] done
    2dup -180 1 v< if
      [ 360 1 v+ ] ]    is angledelta ( n/d n/d --> n/d )

  ' [ [ $      "20"               $      "45"             ]
      [ $     "-45"               $      "45"             ]
      [ $      "85"               $      "90"             ]
      [ $     "-95"               $      "90"             ]
      [ $     "-45"               $     "125"             ]
      [ $      "45"               $     "145"             ]
      [ $      "29.4803"          $     "-88.6361"        ]
      [ $     "-78.3251"          $    "-159.0360"        ]
      [ $  "-70099.74233810938"   $   "29840.67437876723" ]
      [ $ "-165313.6666297357"    $   "33693.9894517456"  ]
      [ $    "1174.8380510598456" $ "-154146.66490124757" ]
      [ $   "60175.773067955546"  $   "42213.07192354373" ] ]

  witheach
    [ do
      dip [ $->v drop ]
      $->v drop
      angledelta
      20 point$ echo$ cr ]