Astrology is really a language, a shorthand for expressing a particular flavor of energy. For example, we can talk about Pluto, which embodies the energy of transformation, of bringing the shadow into light. Saying "Pluto" is a kind of shorthand for that archetypal energy.
But most likely the planets don't actually cause events to happen. They may be indicators of a larger process, one that is involved with synchronicity.
You've probably all experienced synchronicity at some time in your life. Maybe you think of someone and they call. Or you're wondering about a question you have and the words of a headline on a newspaper that you pass on the street give you the beginnings of an answer.
It's easy to just attribute these synchronicities to mere coincidence. But is it? Why does it happen so often? Many people report that as they begin to notice synchronicity, it happens even more frequently, until they are not even surprised when it does.
One commenter on this site asked this:
"Pluto was named by an 8 year old girl shortly after it was discovered in 1906, the name was chosen, in part, because the first two letters, PL, were the initials of the minor planet's discoverer Percival Lowell. Now you're telling us that this name choice affects human behavior?"*
Perhaps there is a larger wave of energy at work here, one that brought in the archetype of transformation, of all that Pluto represents. Perhaps that wave brought in the discovery of the planet, and influenced the girl who chose that particular name. Perhaps she was an instrument of that wave of synchronicity.
Pluto's discovery brought it into consciousness, and its archetypal energies as well. Pluto’s discovery made astrology a little more precise. It doesn't mean that astrology didn't work before, but the discovery added more refinement to the art. Astrology is an evolving art, just as all knowledge evolves. It's not perfect, but then, what system of trying to describe reality is?
* By the way, the same commenter stated that my star charts were out of date, and that Pluto is in Capricorn. If he had read the article carefully, he would have seen that I did indeed know this, and I wrote that Pluto was in Capricorn from 2008 to 2024.