In 1645 the Marquis Cornelio Malvasia, a senator of Bologna with a great interest in astrology, invited Cassini to Bologna and offered him a position in the Panzano Observatory, which he was constructing at that time.
1644. godine markiz Cornelio Malvasia koji je bio bolonjski senator s velikim zanimanjem za astrologiju, pozvao je Cassinija u Bolognu i ponudio mu mjesto u Panzano zvjezdarnici koju je gradio u to vrijeme.