BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
The Force Awakens
Like many a great epic, Star Wars is rooted in a rich history of armed conflict. Now, for the first time, the facts, figures and backstories of major clashes and combatants in the Star Wars universe have been documented in this volume. It combines action-filled narrative with encyclopedic knowledge