Yavin is a fictional planet and its satellite system in the Star Wars Universe. Yavin is famous for the battle over the moon, Yavin 4, depicted in Episode IV: A New Hope. That's the one the Death Star was about to destroy when Han returned in the nick of time and Luke used the force to destroy the Death Star and save the day.
I still remember seeing that movie in the theatre when it came out and my overwhelming sense of awe at that opening seen. Do you?