Here's the thing about astrology: the stars are not, in fact, located upon the planet of Golarion, where prophecy is broken.

Now, mind you, that still doesn't make it at all useful, most of the time. The prophecy noise is not completely localized to the planet and even at significant distances from it the situation is not nearly the equal of what it was a century ago. Astrology even in situations of completely functional prophecy very much has 'predicted fifty of the last five near apocalypses' syndrome despite the fact that around here there are really quite a lot of genuine near misses with apocalypses. It has no combat applications whatsoever, not even the little tricks a divination specialist wizard can do. For nearly all applications, an augury will be more reliable every time, and usually cheaper to boot.

What an augury-- or for that matter a divination-- can't do, though, anymore, is predict the future in vivid detailed color several years in advance with very little divine intervention cost, clearly enough to give you a specific course of action you had better take. Astrology can do that, even in the Age of Lost Omens. It doesn't, usually; you have to get quite extraordinarily lucky. ("Lucky" here meaning "something important enough that Iomedae and Desna both think it's worth it"; the intervention cost isn't zero, it's just a lot cheaper than any other kind of prediction.) 

But it can.