Of course, this tells nothing about well-witching, but illustrates that at least some old beliefs aren't as unreasonable as one might think.
The claims of astrologers are not at all like this. They are vastly more specific.
In The Republic of Plato, there's this idea of rotation between political regimes[0], and it's explained by the way each generation treats the next one. Down to Earth example: think of overprotecting parents making their child unprepared for an ordinary adult life.
Now of course, this is again distant from the discourse of our favorite astrologers, but if you squint a little, there are conceptual similarities.
Thinking about it a little more, and on point to your original remark, I wonder if the fact that a considerable amount of people like to believe in astrology isn't tied to the same instinct that made old people personify everything and anything as Gods: a strong tendency to see order and intelligence in chaos.
After all, science is still about doing just this, minus the anthropomorphism. So, not so shocking: just human nature at works.
[0]: https://en.wikipedia.org/wiki/Republic_(Plato)#Book_VIII%E2%...
We were looking for a water pipe, not just sitting groundwater. The only explanation I could come up with was that for some reason a magnetic field was being created by the pipe underground. I don't remember if the water was flowing or not when we did it.
I feel silly even commenting this, but we truly did find the pipe exactly where I was standing when the rods pointed together.
Of course it's very possible that I unconsciously tilted my hands in the spot where I suspected the pipe would be. Even though I did make a conscious effort to not do exactly that, I wonder if there is some psychological factor in the phenomenon.
Feynman put it this way: The first principle is that you must not fool yourself—and you are the easiest person to fool.
