北方导航

Northern navigation

以上为机器翻译结果，快速获取精准的人工翻译结果，建议选择有道人工翻译

1
北极星的重要性在于可以用来导航。它的位置十分接近北方，所以被称为“北方之星”。
The importance of Polaris is that its position in the sky marks North - and for that reason it is also called the “North Star”.
2
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。
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.

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