aphelion distance
... apex 顶 aphelion distance 远日点距离 aphelion 远日点 ...
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他还指出了，地球在近日点的速度要比它在远日点快，近日点离太阳比较近，远日点是距离太阳最远的地方。
He also figured out the planet goes faster when it's at perihelion, nearer the sun, than when it's at aphelion, its farthest distance.
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