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.
Taking place between the last two Star Wars® films, Episode II: Attack of the Clones and Episode III: Revenge of the Sith, the Clone Wars fill a dark period in the history of the Galaxy. Now young readers can experience more Jedi action, more villainous battles, more weapons, more imagery, more fun, and more excitement! The awesome power of Yoda explodes in Star Wars®: The Clone Wars™ Reader Level 3: Yoda in Action!