远日点

但这并不是简单的一件事情，因为近日点和远日点的日期都会变换。

But it 's not that simple either , because the dates of the perihelion and aphelion are also shifting .

这两轨道的远日点，都只略为超出木星轨道一些。

Their aphelion points are just a little outside of Jupiter 's orbit .

冥王星运行到远日点时，距离太阳46亿英里。

Pluto , at its most distant , is 4.6 billion miles from the sun .

在轨道上最接近太阳的点被称为近日点，而最远离太阳的点被称为远日点。

The point in the orbit nearest the sun is called perihelion , while the point farthest is called aphelion .

他还算出这个行星在距离太阳最近的近日点比在距离太阳最远的远日点时运动的速度快。

He also figured out the planet goes faster when it 's at perihelion , nearer the sun , than when it 's at aphelion , its furthest distance .

他还计算出地球在近日点（即距离太阳最近的点）比在远日点（即距离太远最远的点）运行得更快。

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 .