system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How were years measured before The Battle of Yavin?

Whenever we talk about events before the battle we use BBY (similar the BC in our universe). How did people measure time before that battle though since the obviously didn't know that that battle was even coming. Did the use Years After the 1st Galactic Civil War?
gpt
The Galactic Standard Calendar was based around Coruscant's solar cycle, and it set the standard for the rest of the galaxy. Since its creation along with the Old Republic, historians have used major events as a new turning point, much like the Battle of Yavin is used today. The creation of the Galactic Empire and the Battle of Endor were ones used in recent memory, but others include the Ruusan Reformation and the Great Resynchronization. However, many smaller/more isolated planets use their own calendars, based around events their residents would know extremely well.