"The Secrets of the Vaulted Sky" is a book promoting astrology. Check my link to Amazon.
So, he's a secular Jew who believes in astrology-- at least he's not one of those evil Christians!
I'm sorry, but probably everyone has one or more unproven beliefs, even beliefs that most others would consider whacked. It doesn't invalidate their opinions in other areas or their cognitive abilities . I believe in God (which belief many consider un-proven, although I don't) and I'm also very good at math, and I believe that conservative political views and positions are best for the country. One does not invalidate the others.