比较了VLBI 章动观测值和IAU1980章动理论值，其差异可为改进章动理论提供依据。
VLBI observations of nutations are compared with IAU1980 nutation series. Their deviations can provide a basis for improving IAU nutation theory.
这一章接着说：天下神器，不可为也。然而我们当今的行为就好像我们是这世界的主人，自然界随便归我所用。
Yet we behave as if we do own the world, as if nature was there just for us.
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