It's a bunch of rocks standing around, and the Aubrey holes aren't part of a timekeeping system, they are the old "postholes" of the bluestones (some of which subsequently went missing), meaning the whole thing was restructured during prehistoric times. There is no validity to any of Gerald Hawkin's "Stonehenge Decoded" archaeoastronomy nonsense, as even he eventually had to agree.
I read that book! Lol. So that’s what those were, and not predicting eclipses.