At St. Genevieve he would build an observatory , and continue to work there for forty years .
He would eventually be appointed the librarian of the Abbey of St Genevieve in Paris , and the university 's chancellor .
At Abbey of St Genevieve   he would build an observatory , and continue to work there for forty years .
He would eventually be appointed the librarian of the Abbey of St Genevieve in Paris , and the university 's chancellor .