magnetic declination
柯林斯詞典
1. N the angle that a compass needle makes with the direction of the geographical north pole at any given point on the earth's surface 磁偏角 (Also called declination, magnetic variation)
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1. N the angle that a compass needle makes with the direction of the geographical north pole at any given point on the earth's surface 磁偏角 (Also called declination, magnetic variation)