agonic line


Also found in: Dictionary, Thesaurus.
Related to agonic line: aclinic line, Isogonic lines

agonic line

[ā′gän·ik līn]
(geophysics)
The imaginary line through all points on the earth's surface at which the magnetic declination is zero; that is, the locus of all points at which magnetic north and true north coincide.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

agonic line

agonic lineclick for a larger image
A line drawn on a map or chart joining places of zero magnetic variation. The agonic line is a particular case of an isogonic line.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved