In Synchronicity: An Acausal Connecting Principle, Carl Jung published the results of his astrological study. He compares the charts of married couples. It's a basic study as he only looks for favorable aspects between the Sun, Moon and ascendant in each married couple's charts. The favorable aspects show up in enough charts to rule out chance. It'd be interesting to find out if those without favorable aspects ended up getting divorced. That's a whole other study. Carl Jung's study wasn't really groundbreaking. It only scientifically reinforced what astrologers already knew.