isogonal line

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isog′onal line′

an imaginary line or one drawn on a map connecting all points of equal magnetic declination. Also called i•so•gone (ˈaɪ səˌgoʊn)
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.isogonal line - an imaginary line connecting points on the Earth's surface where the magnetic declination is the same
line - a spatial location defined by a real or imaginary unidimensional extent