One of the mysteries of the English language finally explained.
An imaginary line around the earth passing through both the north pole and the north magnetic pole, at any point on which a compass needle points to true north.
- ‘Extended lines that mark the constant magnetic declination away from the agonic line are called isogonic lines.’
- ‘Navigators on these so-called agonic lines do not need to make the usual correction to their compasses.’
- ‘West of the agonic line, the needle points east of true north, and has an easterly or positive declination.’
- ‘The agonic line goes through Wisconsin near my home but I still have a 1.5 degree east error.’
- ‘When using a compass east of the agonic line, the needle points in a direction that is west of true north.’
Mid 19th century: from Greek agōnios, agōnos (from a- ‘without’ + gonia ‘angle’) + -ic.
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