“When I was ten all I knew was that I hated the weird words used to describe whatever it was that was wrong with my brother — to this day I think it all happened because he was overtaken by evil spirits that got loose in that haunted house ride at the carnival that summer. It’s easier for me to make sense of it that way than it is for me to face the other way — reality.” –Tim Cummings
It’s one of the oldest and most alluring ideas to all of humanity: the notion that what happens in heavens affects what happens on Earth.
Yes, the Sun has a tremendous impact on us, causing the seasons and a large amount of the annual variations that Earth experiences. Even the Moon, to a lesser extent, has an impact on Earth, with the tides and the change in nighttime illumination having substantial consequences. But what about the positions of the planets and stars; is it conceivable that they impact what’s happening on Earth?
Whether it makes perfect sense or sounds totally unreasonable to you is irrelevant; if we want to know the answer, we can test it! That’s the essence of science, and that’s what separates valid science from pseudoscience.