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agonic line

noun
1.
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.
Origin
1860-1865
1860-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for agonic line
  • When the two poles align, declination is zero, and the line of zero declination is termed the agonic line.
British Dictionary definitions for agonic line

agonic line

noun
1.
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
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agonic line in Science
agonic line
  (ā-gŏn'ĭk)   
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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