进动轴 axis of precession; precession axis 联动轴 connected shaft; universal driving shaft ..
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Precession, basically is the change in the direction of earth's axis of rotation.
岁差，基本上是地球自转轴方向的改变。
The Earth's axis in its orbit does the same thing because of a phenomenon called precession, and is now facing a different star than it did 5, 000 years ago.
地球的地轴做了类似的事情，因为一种现象叫做岁差，现在所面对的是与5000年前不同的星星。
Even given the precession of the Earth's rotational axis over the millennia, the Sun continues to rise over Stonehenge in an astronomically significant way.
即使有几千年的地球自转轴的进动，太阳仍然以天文意义上的方式从巨石阵上方升起。
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