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.
近点距离， 近点角从太阳观察到的行星距近日点的角度偏差。
The angular deviation, as observed from the sun, of a planet from its perihelion .
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