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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
isogonaal . Lennunduse terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://127.0.0.1:5577/search/unif//len/isogonaal/1/est (09.10.2026)
