In 1778 he began publishing various in-depth dissertations on astronomical objects, the Effemeridi di Milano (Ephemerides of Milan).
Following the publication of an ephemeris by S. C. Chandler, which suggested the comet could be located 20° from Rigel by the end of February, astronomers in the United States eagerly waited for it to move far enough into northern skies to be visible.
He taught various mathematical topics including the science of numbers, astronomical tables and astrology, in Aleppo and Mosul.
He is known for his freewares WinAstrometry (used at many Italian amateur observatories for the calculation of the astrometric positions of the asteroids from CCD images) and waEphemeris, a minor planets ephemeris.
Since the Earth's rotation is irregular, any time scale derived from it such as Greenwich Mean Time led to recurring problems in predicting the Ephemerides for the positions of the Moon, Sun, planets and their natural satellites.