isogonal

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isogonal

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A line drawn on a map or a chart joining points of equal variation (magnetic declination). On aeronautical charts, isogonic lines appear as irregular dashed lines (−3° E), and their values also are indicated alongside the lines. The annual change in their values is indicated at the bottom of the chart. Also called an isogonic line.
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MarusiC Hamilton cycles and paths in vertex-transitive graphs-current directions.