He said a lot of reasonably outrageous things in his book. And did claim some missing time, if not memories of abduction. And mind reading incidents, etc. But I think the astrology claim was based on anecdotal empirical evidence.
He also alleged that AIDS is not caused by HIV, but is simply a catastrophic build up of varous infections and diseases in the homosexual community, brought on by their unbelievably promiscuous life style. Interestingly, David Horowitz argues similarly.
Space in the book was devoted to his opinion that the Global Warming crisis is non existant. There was a chapter dealing with that kind of thing entitled "The Age of Chicken Little."
I can't necessarily accept everything he said either, but his prominence as a scientist obliges me to at least listen to it. Plus, the book was fun reading.