In meteorology, an isogon is a line of equal or constant wind direction on a graph, plot, or map; an isopleth of wind direction.
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This line is a particular case of an isogonic line. The position of this line exhibits variations in time, but in 1995 was so located that it emanated from the north magnetic pole, trended southward through the Great Lakes region, ...
a line changes continuously except when it is actually meridional or when it is curved so as always to cross meridians at the same angle. Magnetic course also changes but in a nonuniform manner because of the lack of complete symmetry in the isogonic ...
 See also: Surface, Observation, Layer, Wind, Meteor
  
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