a great astronomer, born at Nice in Bithynia, flourished between the 154th and 163d Olympiads. His commentary upon Aratus's Phenomena is still extant. Rohault was very much mistaken when he asserted, that this astronomer was not acquainted with the particular motion of the fixed stars from west to east, by which their longitude changes. By foretelling eclipses, he taught mankind not to be frightened at them, and that even the gods were bound by laws. Pliny, who tells this, admires him for making a review of all the stars; by which his descendants would be enabled to discover whether they are born and die, whether they change their place, and whether they increase and decrease.