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.
Aphra's got debts to pay. But can she can stay one step ahead of the Empire, some Bounty Hunters and just about everyone else in the galaxy!?