"Magnetic declination is the angle between magnetic north (the direction the north end of a compass needle points) and true north. The declination is positive when the magnetic north is east of true north. The term magnetic variation is a synonym, and is more often used in navigation. Isogonic lines are where the declination has the same value, and the lines where the declination is zero are called agonic lines."
I still do not quite understand the last sentence about Isogonic Lines, anyone knows?
Mir From United States of America, joined Jan 2004, 20484 posts, RR: 56 Reply 3, posted (1 year 4 months 5 days 17 hours ago) and read 2619 times:
If you're familiar with contour lines on a map, isogonic lines use the same principle. Just like every point on a contour line has the same altitude, every point on an isogonic line has the same magnetic variation.
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