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agonic line

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noun

an imaginary line on the surface of the earth connecting all points at which the declination of the magnetic field of the earth is zero.

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Origin of agonic line

First recorded in 1860–65

Words nearby agonic line

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for agonic line

agonic line

noun

an imaginary line on the surface of the earth connecting points of zero magnetic declination
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for agonic line

agonic line
[ ā-gŏnĭk ]

An imaginary line on the Earth's surface connecting points where the magnetic declination is zero. The agonic line is a line of longitude on which a compass will show true north, since where magnetic declination is zero, magnetic north coincides with geographic north.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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