iso·gon·ic /ˌaɪsəˈgɑnɪk/
  (a.)等偏角的
  I·so·gon·ic a.  Pertaining to, or noting, equal angles.
  Isogonic lines Magnetism, lines traced on the surface of the globe, or upon a chart, connecting places at which the deviation of the magnetic needle from the meridian or true north is the same.
  I·so·gon·ic, a. Zool. Characterized by isogonism.
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  isogonic
       adj : having or making equal angles