original question: Which fictional calendar system is preceded by [Before Battle of Yavin]?
answer: after battle of yavin
answer type: Fictional Calendar System.
auxiliary information: The Before Battle of Yavin time system (or BBY) is the calendar system used in later works of the Star Wars fictional universe for events occurring before The Battle of Yavin and the destruction of the first Death Star as seen in Star Wars Episode IV: A New Hope. The BBY system counts in reverse up to that event. (5 BBY occurs before 4 BYY chronologically)
[Before Battle of Yavin] is preceded by which fictional calendar system?