 He then obtained a post in the observatory at Paris, made important discoveries in regard to magnetism, comets, eclipses, meteors, and sunspots, and made improvements in astronomical clocks.Laugier determined the exact latitude of the Paris observatory (1853), correcting previous errors.He published a catalogue of fifty-three nebulae, and another (1857) of the declination of 140 stars, and contributed astronomical papers to the "Connaissance du Temps".