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In his Rudolphine Tables ( 1627 ), Johannes Kepler used a prototype of year zero which he labeled Christi ( Christ ) between years labeled Ante Christum ( Before Christ ) and Post Christum ( After Christ ) on the mean motion tables for the Sun, Moon, Saturn, Jupiter, Mars, Venus and Mercury.
Then in 1702 the French astronomer Philippe de la Hire used a year he labeled at the end of years labeled ante Christum ( BC ), and 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 Julian years labeled avant Jesus-Christ ( before Jesus Christ or BC ), and immediately before Julian years labeled après Jesus-Christ ( after Jesus Christ or AD ).

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