Isogonal, Isogonic, Line. Line drawn through all positions on Earth having the same magnetic variation.
Isohel. Line, on meteorological chart, passing through all places having the same period of sunshine.
Isohyet 183 Ivory's Rule
Isohyet. Line, on meteorological chart, passing through all places having the same amount of rainfall.
Isoneph. Line, on a meteorological chart, passing through all positions having the same amount of cloud.
Isotherm. Line, on a meteorological chart, passing through all positions having the same temperature.
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