行星逆行是占星学中的一个概念,指的是从地球观察,行星在天空中相对于其正常运动方向出现暂时倒退的现象。这种现象实际上并不涉及行星的真实运动,而是由于地球和行星之间相对运动的结果。

以下是一个简化的动画演示,用以说明行星逆行的概念:
1. **正常运动**:首先,我们可以看到行星(例如火星)按照其轨道正常向东运动。
2. **相对运动**:接着,我们模拟地球绕太阳公转的同时,火星也在绕太阳公转。由于地球的公转速度比火星快,从地球上看,火星似乎在一段时间内开始“倒退”。
3. **逆行现象**:在地球和火星的相对运动中,火星会达到一个点,看起来似乎在天空中向西移动,这就是所谓的“逆行”。
4. **逆行结束**:经过一段时间后,火星再次开始向东运动,逆行现象结束。
以下是一个简化的动画示例:
```
正常运动: -> -> -> -> -> -> ->
相对运动: -> -> -> -> -> -> -> <- <- <- <- <- <- <-
逆行现象: <- <- <- <- <- <- <- -> -> -> -> -> -> ->
逆行结束: -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> -> 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