This is heavily involved with predictions. Astrology today isn't that interested in predictions and heavily leans towards personality readings and the person's thoughts and emotions.
Like I said, you can thank Ptolemy and the Medieval, Arab and Persian astrologers for destroying astrology.
When Robert Hand wrote
Planets in Transit back in 1976 he used natal chart delineations of aspects on the belief that transiting/directed/progressed aspects have the same meaning.
Over time, he and many other prominent respected astrologers noticed most transiting aspects do nothing and when something good should have happened, something bad happened and when something bad should have happened it turned out remarkably well.
That led him to believe that all the procedures and methods for transits was wrong and he was right about that.
That's why he joined forces with Robert Zoller and Robert Schmidt to tear apart the Greek texts to find out what's really going on.
Something about these texts that people don't understand. Nearly all of the texts from antiquity were in the hands of private collectors. Some where in the hands of private groups like churches, museums or private libraries (like a Masonic library). The universities had to pay good money to purchase those texts.
All the texts were in poor to bad condition so they had to be restored which requires using x-rays and ultraviolet light (they weren't using Sharpies so the ink wasn't indelible) and it means paying to get access to other manuscripts in order to do a comparative analysis where the text is missing or corrupted. That ain't free. It's costly and time-consuming. And while one of your professors is analyzing/translating the texts that means you incur an additional expense to hire someone to teach their classes.
At the end of the day, the universities want a return on their investment plus a profit and the professors doing the work want to profit off of it so these texts are closely guarded and no one has access to them.
Once Neugebauer and Pingree are getting on in years the universities start allowing "outsiders" access to the texts which is how Zoller, Schmidt and Hand got hold of them. Neugebauer sucks because he didn't believe in astrology and didn't understand the concepts any more than the Medieval, Arab or Persian astrologers did so his translations are not very good. Pingree was open to astrology, had a better understanding of the concepts and unlike Neugebauer would actually contact astrologers to explain things to him so's he could understand them.
Is there any value in reading Bonatti or anything by the Arabs and Persians? Their natal/mundane delineations are mostly right. Mostly.
But their procedures and methods? Totally messed up.
They messed up the meanings of the signs, stars, the places, the rank of the places, primary methods, secondary methods (solar returns and progressions), transits, Lots, triplicities and a lot more especially with their silly "accidental dignity/debility" and their almutens and scoring systems which is why they don't work and people get frustrated and give up.
Basically, astrology is 2,000 years of the Telephone Game and here's a real-world example where "together we will make a world of difference" morphs into "we're setting a record." They only way to get at the truth is to go back to the source.
The Greeks did use planetary periods but the Arabs and Persians didn't understand them and worse, the Persians borrowed the system from Jyotish and we know they did because it includes the nodes. In Hellenistic, the nodes are only important in electional/horary. You wouldn't want to built or launch a space shuttle when Moon is conjunct/square the nodes within 6°. And this Firdaria the Persians borrowed gets adopted by the Arabs except it doesn't work because it's like taking a part from a diesel engine and sticking it on a gasoline engine and then whining that it doesn't work. Most the Renaissance astrologers ignored it except for Schoener who tried to fix it but then the Classical astrologers didn't understand it so they (thankfully) ignored it but that's why Modern astrology is what it is.
I don't fault people for not knowing something that couldn't have been known but the info's been out there for quite a while now and there's no excuse not to know.