He took his eighteen year old son Jacques Cassini with him and they made numerous geodesic observations, as well as returning to Bologna where they repaired the gnomon at the Church of San Petronio in Bologna which Cassini had designed nearly thirty years before.
Siya kinuha ang kanyang labing-walo taon gulang na anak na lalaki Jacques Cassini sa kanya at sila ay ginawa maraming heodesiko obserbasyon, pati na rin sa pagbalik sa Bologna kung saan sila repaired ang gnomon sa Simbahan ng San Petronio sa Bologna na Cassini ay dinisenyo halos tatlumpung taon bago.