pole of the equator [天] 赤极
Next they had to decide on a "natural" length. They chose one ten-millionth of the distance from the Equator to the North Pole.
接下来他们必须决定一种“自然的”长度,他们选择了从赤道到北极距离的一千万分之一,他们将它称作一米。
This means that near the north or South Pole you are actually closer to the centre of the earth-where the Angle is being measured from-than you would be at the equator.
这就意味着,如果你身处南极或北极附近,你离地心的距离就比在赤道更近一些——纬度的测量就与地心有关。
The Earth isn't completely spherical - land at the North Pole is a number of kilometres nearer to the core of the planet than land at the Equator.
事实上,气球并非是一个完美的球体,北极地区要比赤道地区更加接近地心,两地之间的这一差距大概是在数公里。
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