They lived at first in the d'Assy house in the le Marais district of Paris where, except for when he had been on his travels, he had continued to observe in the observatory above his room from the time it was first built for him.
Nad elasid esimesel aastal d'Assy maja Le Marais district of Paris, kus, välja arvatud juhul, kui ta oli oma reisil ta oli jätkuvalt kinni vaatluskeskuse üle oma toas alates ajast, see oli esimene ehitatud teda.