isogon ( synonym found)
Definition of isogon:

°A line of equal or constant wind direction on a graph or chart, such as a weather map.
°A line of equal or constant magnetic declination on a chart; an isogonic line.
Definition of isogon:

°A line of equal or constant wind direction on a graph or chart, such as a weather map.
°A line of equal or constant magnetic declination on a chart; an isogonic line.
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