Lunar rock samples brought back by the Apollo astronauts provided evidence of an ancient magnetic field on the Moon about 100 times weaker than the Earth's magnetic field.
阿波罗号宇航球带回的月岩石样本证明了在月球上存在着古老的磁场区域，并且磁场强度比地球磁场强度弱一百倍。
In the humanity history, it is one most ancient measuring technique surveying the direction using the Earth magnetic field.
利用地球磁场来测量方向是人类历史上最古老的测量方法之一。
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