Definition of isogonic line
: an imaginary line or a line on a map joining points on the earth's surface at which the magnetic declination is the same
— called also isogonal
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“Isogonic line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isogonic%20line. Accessed 18 Aug. 2022.
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Time Traveler for isogonic line
The first known use of isogonic line was circa 1859
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