magnetic variation

noun Navigation.
variation ( def 8 ).
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magnetic variation
 
n
another name for magnetic declination

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Magnetic declination, sometimes called magnetic variation, is the angle between magnetic north and true north.
Is the office of primary responsibility for establishing policy for worldwide application of magnetic variation values.
Lines drawn across aeronautical charts to connect points having the same magnetic variation.
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