Indicating or connecting points of the earth’s surface at which the magnetic declination is the same.
More example sentences
- By 1701 Edmond Halley had dashed these hopes, showing that in the western North Atlantic, for instance, the isogonic lines (of constant variation) run almost east-west and so are independent of longitude.
mid 19th century: from Greek isogōnios 'equiangular' + -ic.
Definition of isogonic in:
- The US English dictionary