Isogonic line synonyms, isogonic line antonyms - FreeThesaurus.com
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Synonyms for isogonic line
an imaginary line connecting points on the Earth's surface where the magnetic declination is the same
References in periodicals archive
The upshot is that the isogonic lines
showing magnetic variation on sectional charts shift more dramatically each time these updates are applied.
Edmond Halley introduced the isogonic lines
or magnetic meridians in the southern hemisphere and Louis Duperrey situated the magnetic South Pole at 76[degrees]S and 135/6[degrees]E.
If the isogonic lines
(the lines of equal air pressure between highs and lows) on the chart are bunched up and close together, expect turbulence aloft.
The isogonic lines
on en route charts are updated every five years, when a new model comes out.