agonic lineyoudaoicibaDictYouDict[agonic line 词源字典]
"An imaginary line round 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", Mid 19th century: from Greek agōnios, agōnos (from a- 'without' + gonia 'angle') + -ic.[agonic line etymology, agonic line origin, 英语词源]