解：我们已经知道在平面极坐标中代入题中r 的表达式即有 它们相应于近日点和远日点(perihelion and aphelion)或近地点和远地点 (perigee and apogee)的径向加速度，与法向加速度只差一个符号. MSN 空间完美搬家到新浪博客！
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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。
This composite neatly compares two pictures of the Sun taken with the same telescope and camera on the dates of Perihelion (closest approach) and Aphelion in 2008.
这张合成照片直观地比较了两张由同一台望远镜和照相机拍摄的太阳，一张拍摄于2008年近日点，另一个拍摄于同年的远日点。
W hen the Earth moves from perihelion to aphelion, its radiation belts are expansion, and aphelion to perihelion contraction.
当地球从远日点运动到近日点时，地球辐射带向内收缩。
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