system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars]Why is the battle of Yavin used as the dating point in the galaxy?

Sure it was a defeat for the Empire but it wasn't the end of it, but wouldn't the battle of Endor be a better candidate?
gpt
It was more for the significance of the battle. It marks the destruction of the first Death Star, an unbelievably huge victory for the rebels. Not just in the destructive power of the Death Star's weaponry, but also the millions of Imperials on board, all the resources it held, thousands of ships, and all the time it took to build (20-some years?).

It's also a major boost in confidence, moral, and credibility for the rebellion as it's their first major victory that shows that the Empire isn't all-powerful and can be taken down. After the Battle of Yavin, the rebellion started gaining support from thousands of systems that were originally neutral or not-pro-rebellion in the war.