The Great ReSynchronization was a 60 year long notation system that was established in 35 BBY by the Republic Measures & Standards Bureau to recalibrate the disparate dating systems used by the Galactic Republic. Later in 25 ABY, it was disbanded and reorganized by the New Republic into the GSC. It was since used as a zero year for the dating system; thus, the Battle of Geonosis takes place in the year 13, the Great Jedi Purge in the year 16, Battle of Yavin in the year 35, and the Battle of Endor in the year 39. The Seventh Battle of Ruusan occurred in the year 965 BrS. ex. 4,965 BrS