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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How to use agonic line in a sentence
To the east of the agonic line the declination is westerly, and to the west it is easterly.
At present the motion of the agonic line seems to be towards the west, but it is very slow.
The line passing through points where the needle points north, without declination, is the agonic line.Physics | Willis Eugene Tower
agonic line, line along which the needle points due north and south.The Nuttall Encyclopaedia | Edited by Rev. James Wood
British Dictionary definitions for agonic line
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
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.
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