The north Magnetic Pole is moving slowly northwest across the northern stretches of Canada.
北磁极在缓慢地通过加拿大北方向西北方向移动。
Researchers also discovered that the planet's magnetic field is shifted about 300 miles north from the equator.
研究人员还发现，水星的磁场从赤道向北偏转了大约300英里。
Kuo discovered that compasses do not point true north but to the magnetic North Pole. This was a decisive step to make them useful for navigation.
沈括发现，指南针并不是真正的指向北方，而是指向地磁的北极，这对指南针用于导航走出了决定性的一步。
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