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.
Star Wars: The Rise of Skywalker: The Official Guide is a 96-page informative guide to Star Wars: The Rise of Skywalker for younger fans, revealing the characters, creatures, droids, locations, and technology from the new film. Packed with images and information, it’s the perfect companion for those who want to relive the movie outside of the theater.