I'm not clear on the details, but I know the constellations are made out of stars, I think planets like mars were thought to be major stars, and I'd think sayings like "the stars aligned" would have roots in astrology...

I will also nitpick and say that they said astrology terms, specifically - if astrology considers constellations to be important, and acknowledges they are made out of stars, I'd imagine stars would be part of the terminology. (Doubly so if I'm correct about astrology having (at least previously) a skewed view on what a star is!)