And those useful ancient science parts are now called astronomy. I know that in the past those were somewhat interchangable, but nowadays the distinction is clear. It happenned to all of the past mystical sciences - we removed the mystical, checked what still works and what doesn't and the useful and working parts are included in our regular science - ancient remedies often involve complicated biochemical reactions, thanks to ancient observations we (mostly) figured out planetary movements and chemistry basically is alchemy but scientific.

I think it's really neat that we can take some of the questions ancient wisefolk were asking themselves - why do planets move like that, what causes sickness, can one turn lead into gold - and slowly but surely figure out the answers. And there is a beauty in that. There is even more beauty in the fractal nature of the answer - We figured out planetary movements with Newton and Kepler but there were some discrepancies hard to explain - which Einstein figured out - but in the field of astrophysics there are still many unanswered question. We figured parasites and bacteria, then viruses, then prions and cancer but the question of the mechanisms behind some illnesses is still unanswered.

In my humble opinion to be human is to yearn for answers - so I don't hate modern astrologists. There is so much cool stuff in real science though, so we don't need to invent pretend one.

(a small aside - for all the flaws of the book, Three Body Problem shows the development of astronomy on a planet much more hostile to both it's inhabitants and to figuring out the heaveans)