Aviation Dictionary

Agonic line

An irregular imaginary line across the surface of the Earth along which the magnetic and geographic poles are in alignment, and along which there is no magnetic variation.

Dictionary Term

Agonic line

Definitions

An irregular imaginary line across the surface of the Earth along which the magnetic and geographic poles are in alignment, and along which there is no magnetic variation.
An isogonic line along which there is no magnetic variation.
Aline along which there is no magnetic variation.

References

Helicopter Flying Handbook, Federal Aviation Administration, 2019
Instrument Flying Handbook, Federal Aviation Administration, 2014
Pilot's Handbook of Aeronautical Knowledge, Federal Aviation Administration, 2023
Rotorcraft Flying Handbook, Federal Aviation Administration, 2000