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.
V roku 1644 senátor Bologne Marquis Cornelio Malvasia, ktorý sa veľmi zaujímal o astrológiu, pozval do Bologne Cassiniho a ponúkol mu miesto v observatóriu v Panzane, ktoré sa práve stavalo.