perihelion

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

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。

The perihelion of the earth each year is just several days after Christmas Day ( 3 or 4 January). So, the distances from the earth to the sun and from the earth to the moon may reach the closest point around Christmas every 4.425 years.

而每年的地近日点（1月3日或4日）正置圣诞节过后几天，因此，日、月、地相对运动每隔4.425a在圣诞节前后三者距离总会达到最近。

In 1859, Le Verrier discovered the mercury perihelion advance anomaly.

在1859年Le Verrier发现了水星近日点进动之异常。

The angular deviation, as observed from the sun, of a planet from its perihelion.

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.

When perigee and perihelion coincide tidal range is at its greatest.

当月球与地球到达它们的近地点和近日点的时间恰好重合时,就会引起最大的潮汐.

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

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 Runge-Lenz Vector and the Perihelion Precession of Mercury Orbit

Runge-Lenz矢量与水星近日点进动

Perihelion is the point in orbit nearest the parent star, and asteroid 2000 BD19 has the smallest orbit, getting incredibly intimate with the giant, hot ball of nuclear explosions that keeps us warm and alive.

近日点是最接近母恒星的轨道上的点，而序号为2000BD19的小行星拥有最小的轨道，与太阳无限接近。太阳是巨大的伴有核爆炸的火球，它为人类提供了温暖和生命。

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.

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 furthest distance.

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。

Although predicting the brightness of comets with any degree of accuracy is very difficult, Hale-Bopp met or exceeded most predictions when it passed perihelion on April 1, 1997.

虽然预测彗星在不同角度的亮度是非常困难的，但是当1997年4月1日海尔波普彗星通过近日点时，达到甚至超过了大多数的预测。

How much does the direction of perihelion change each orbit?

近日点方向使每个轨道改变了 多少 ?