Agonic line
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.
Historical Examples
The line passing through points where the needle points north, without declination, is the agonic line.
Physics Willis Eugene Tower
To the east of the agonic line the declination is westerly, and to the west it is easterly.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 3 Various
agonic line, line along which the needle points due north and south.
The Nuttall Encyclopaedia Edited by Rev. James Wood
At present the motion of the agonic line seems to be towards the west, but it is very slow.
Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 3 Various
noun
an imaginary line on the surface of the earth connecting points of zero magnetic declination
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.
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