One of you asked this question. “Does a magnetic compass point to the North Pole?”
前段时间有观众向我们提问：“罗盘的指针真的指向北极吗？”
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。
They point to evidence of pole shifts in Earth's past and claim that these reversals can be calculated by studying sunspots or magnetic field theory.
他们指出，地球曾在过去发生磁极翻转，这是谁都无法否认的事实。通过研究太阳黑子或者磁场，我们可以对磁极翻转进行计算。
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