He took some hasty measurements of its position and direction of motion, and using an old clock and a pendulum with which he took his patients’ pulses, he estimated the duration of the transit at 1 hour, 17 minutes and 9 seconds.
Lescarbault je opazoval tudi prehod Merkurja leta 1845 in je menil, da opazuje drugi prehod, vendar še neodkritega telesa.