Agonic-line meaning

ā-gŏnĭk, ə-
An imaginary line on the earth's surface connecting points where the magnetic declination is zero.
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An imaginary line on the earth's surface along which true north and magnetic north are identical: at any point along this line, the declination of a compass needle equals zero.
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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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(cartography, navigation) A line on a chart or map joining points of zero magnetic declination.
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Origin of agonic-line

  • Greek agōnos having no angle (a- without a–1) (gōniā angle diagonal) –ic

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Wiktionary