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我用三角函数计算出月亮距地只有6000公里,是哪里出错了?
如果我们沿着经过P0点的地球大圆周找到两个观测点P1和P2,这两个点能够刚好看到月亮出现在地平线上,也就是仰角为0度。那么,这两个点是该大圆 ...
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