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agonic line
Definição1
A line along which there is no magnetic variation.
Fonte1
FEDERAL AVIATION ADMINISTRATION. Rotorcraft flying handbook (FAA-H-8083-21). Washington, DC: FAA, 2000. Disponível em: . Acesso em: 10 fev. 2012.
Contexto
The amount of variation depends on where you are located on the earth ’s surface. Isogonic lines connect points where the variation is equal, while the agonic line defines the points where the variation is zero.
Subárea1
Aeronautical Cartography
Português
linha agônica
Imagem

Isogonic lines for the year 2000. The agonic lines are thicker and labeled with

Isogonic lines for the year 2000. The agonic lines are thicker and labeled with "0".

Fonte: http://commons.wikimedia.org/wiki/File:IGRF_2000_magnetic_declination.gif