词条 天底
描述: 天底定义为观测者正下方的一点。这个点是随观察者位置的变化而变化的。对位于伦敦的观测者来说，他的天底与位于北京或开普敦的观测者的天底是不同的。若用角度来度量，则天底与地平线成90度。与天底相对的一点称为天顶。
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