The year3,642 before the Battle of Yavin (BBY) was a time period that brought significant changes to the state of the galaxy. Also known as the year 11 after the Treaty of Coruscant (BTC), it marked the end of the Cold War between the Galactic Republic and the Sith Empire and the renewal of hostilities in the form of the Second Great Galactic War. A galaxy-spanning conflict similar to the first, the second war's origins could be traced back to numerous events and proxy wars between the two galactic powers during the previousdecade and the early months of the year. Conflicts from the year before such as the Desolator Crisis, Plan Zero, and the defection of the Republic's Havoc Squad served to increase the tensions between the Empire and Republic, and open warfare soon broke out in when the planetBalmorra was liberated from Imperial control and the Empire conquered the world of Taris. The freeing of the ancient Jedi MasterRevan was the event that finally sparked the Empire into action, marking the end of the Cold War and a return to open conflict.
Thanks to Baras' machinations, his student is successful in the assassination of Baras' former master Darth Vengean on Dromund Kaas, allowing Baras to take Vengean's place on the Dark Council.[10]
↑The New Essential Chronology states that the Ruusan Reformation occurred in 1,000 BBY, which is the zero point of the calendar based on the Ruusan Reformation, so the difference between the calendar based on the Battle of Yavin and the Ruusan Reformation's year-notation system is 1,000 years. This date is derived using simple math based upon other confirmed dates.
↑The New Essential Chronology states that the Ruusan Reformation occurred in 1,000 BBY, which is the zero point of the calendar based on the Ruusan Reformation, so the difference between the calendar based on the Battle of Yavin and the Ruusan Reformation's year-notation system is 1,000 years. This date is derived using simple math based upon other confirmed dates.