magnetic axis of the earth
... the easy magnetic axis 易磁化轴 magnetic axis of the earth 地球磁轴线 quadrature-axis magnetic flux 横轴磁通 ...
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The Geographic pole is the top of the axis on which the earth spins, the Magnetic pole is where the compass points to, and the Arctic pole is the point on the Arctic Ocean furthest from any land.
BBC: NEWS | UK | British man scores polar success