Submitted by György Chityil ... on Fri, 01/19/2018 - 20:21 Hierarchy: NounDescription: {{cartography|navigation}} A line on a chart or map joining points of zero magnetic declination.Ngram: agonic lineNgram Text: agonic lineSource: WiktionaryIssue: 0Wiktionary tag: cartographynavigationNgram Count: 2