'Isogonic lines' definitions:

Definition of 'Isogonic lines'

From: GCIDE

Isogonic \I`so*gon"ic\, a. [Iso- + Gr. gwni`a angle.] Pertaining to, or noting, equal angles. [1913 Webster]
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. [1913 Webster]

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