isogonic line

A line on a map connecting points of equal magnetic declination.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

isogonic line - an imaginary line connecting points on the Earth's surface where the magnetic declination is the same

isogonal line, isogone

line - a spatial location defined by a real or imaginary unidimensional extent

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References in periodicals archive

In North America, the division between E and W variation runs on an isogonic line, often referred to as the agonic line, which roughly extends from Minneapolis/St.

When the Earth moves: runway numbers change as the magnetic poles shift their positions. There's always someone who doesn 't get the word

With all the handheld GPSes, iStuff, and other gadgets, when did you last measure the distance between two points on a paper chart, measure your true course against the longitude and search for the nearest isogonic line to east-is-least your magnetic course?

Good riddance

Many other presentations contributed accounts of little known or unknown artefacts, for example the MS chart of isogonic lines c.1585 by Luis Texeira, and often provided new interpretations of their production and contexts.

Conference notes

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