# Page:Popular Science Monthly Volume 18.djvu/785

an historian of the early ages of the Church, invented a new cycle to which chronologers might refer all dates. It consisted of the multiple of the years of the three cycles of the sun, moon, and indiction, 28${\displaystyle \times }$19${\displaystyle \times }$15 ${\displaystyle =}$ 7,890, and taking these cycles, as settled by the early Church councils, and tracing them backward, he found they would begin together in the year 710 before the creation of the world, according to our received account. This cycle would have been of great value and importance, had it not been superseded by the adoption of the Christian epoch, which, as already said, has made the use of all former epochs and eras unnecessary. The cycle just described is known by the name of the "Julian period."