来自《耶鲁大学开放课程：基础物理 第7集 第7集》

• 
  
  and that's called the procession of the orbit.
  这叫作轨道的进动
• 
  
  And one of the biggest mysteries was Mercury had a procession.
  最神奇的事情之一是水星的进动现象
• 
  
  In other words, the orbit was not closing
  换句话说 轨道不是闭合的
• 
  
  but like a Rosetta Stone it is doing this --
  而是像罗塞塔石碑那样
• 
  
  not at this rate but very, very slowly.
  只是没有这样的速率 而是非常非常慢
• 
  
  The majority of that procession was fully understood
  我刚才提到的效应
• 
  
  by the effects that I mentioned to you,
  基本解释了进动现象
• 
  
  namely the fact there are other forces on it.
  也就是其它作用力的存在
• 
  
  Jupiter, particularly, is a very massive planet;
  尤其是木星 这是个质量很大的行星
• 
  
  you cannot ignore this effect.
  你们不能忽视这个影响
• 
  
  But still there was a tiny part that was missing,
  但仍然有被忽略的很小的部分
• 
  
  which is 43 degrees of an arc per century --
  是每世纪43角秒