An imaginary line or a line on a map joining points on the earth’s surface at which the magnetic declination is the same.
OR
An imaginary line connecting points on the Earth’s surface where the magnetic declination is the same.
An imaginary line or a line on a map joining points on the earth’s surface at which the magnetic declination is the same.
OR
An imaginary line connecting points on the Earth’s surface where the magnetic declination is the same.
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