With geomagnetic field model records, several kinds of secular variation of geomagnetic dipole moment and the position of the geomagnetic North Pole during the year 0 ~ 2000 a.

利用地磁场模型资料，计算和分析了公元0 ~ 2000年的地磁场偶极子磁矩和地磁北极位置的长期变化。

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Y is tangential to the ground at the device's current location and points toward the geomagnetic North Pole.

值是设备当前所处位置与地磁北极的正切值。

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The Geomagnetic pole is the north end of the axis of the geomagnetic field which surrounds the Earth and extends into space as the magnetosphere.

BBC: NEWS | UK | British man scores polar success