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a line on a map or chart on which all points have the same magnetic variation for a specified epoch, ühesuguse magnetilise deklinatsiooniga punkte kaardil ühendav joon
isogonic line . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/isogonic%20line/1/eng (20.06.2026)