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Since you have all three positions in the same frame (in this case ECI but it doesn't matter which one for the purposes of your question), you calculate the angle the same way I did in this answer. The cosine of the angle between any two unit vectors $\mathbf{\hat{a}}$ and $\mathbf{\hat{b}}$ is their dot product: $$ \cos(\theta)=\mathbf{\hat{a}} \cdot \...


This is a simulation program set up to run outside all sensible and appropriate bounds - to go at that speed the iterations just don't work. The mathematics is not realistic here. So what you are seeing is some fun graphics, no more no less.

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