In 1771 Cassini's father, Cassini de Thury, was made Director of the Paris Observatory by the King with the conditions that succession would be preserved for the Cassini family.
In 1771's Cassini ama, Cassini de Thury, ay ginawa Director ng Paris obserbatoryo ng King sa kondisyon na ang sunod ay magiging nakapreserba para sa Cassini pamilya.