In 1627, the German astronomer Johannes Kepler first used an astronomical year which was to become year zero in his "Rudolphine Tables". He labeled the year "Christi" and inserted it between years labeled "Ante Christum" (BC) and "Post Christum" (AD) on the mean motion pages of the Sun, Moon, and planets. Then in 1702 the French astronomer Philippe de la Hire used a year he labeled at the end of years labeled "ante Christum" (BC), immediately before years labeled "post Christum" (AD) on the mean motion pages in his "Tabulæ Astronomicæ", thus adding the designation "0" to Kepler's "Christi". Finally, in 1740 the French astronomer Jacques Cassini , who is traditionally credited with the invention of year zero, completed the transition in his "Tables astronomiques", simply labeling this year "0", which he placed at the end of years labeled "avant Jesus-Christ" (BC), immediately before years labeled "après Jesus-Christ" (AD).