Isogonic Lines
From Britannica 11th Edition (1911) Isogonic Lines (Gr. ἰσογώνιος, equiangular), lines connecting those parts of the earth’s surface where the magnetic declination is the same in amount (see Magnetism, Terrestrial).
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☰ Source: https://oldpedia.org/article/britannica11/Isogonic_Lines | License: Public domain in the USA. Project Gutenberg License
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