Eusebian cera of me Creation is the 486th year before the Julian period; to which, if 4714 be added, it will give 5200, the years of the Creation before the vulgar aera. If, therefore, the years of the world in the Eusebian chronicle, be less than 5200, subtract them from 5200, and the remainder will be the years before Christ; but if they exceed that number, subtract 5199 from them, and the remainder will be the years after Christ: thus, suppose 5158 of the Eusebian aera be subtracted from 5200, it will leave 42, the year before Christ; but if 5199 be subtracted from 5228, the year of the Eusebian, it will leave 29, the year after Christ. The knowledge of this aera is of use in reading the Chronicon of Eusebius and the Roman Martyrology. According to Scaliger, the world was created in the 764 th year of the Julian period, and consequently 3949 years before Christ; but Usher dates the Creation from the 710th year of the Julian period, and 4004 before the vulgar aera; which computation is the most generally admitted among modern cnronologers