In "A New Hope" Luke looks out at the horizon as the suns were setting. We can imagine by his expression that he sees his future turning into his present. That he will always live on Tatooine, work on a moisture farm, and generally never know what it is like to travel in space, to see distant worlds, or have the ability to fight against the Empire...no matter how much he wanted to.

For Luke, this was a down moment that turned out to be completely wrong. Quickly his life would change and he wouldn't merely fight against the Empire, but ultimately, take on the entire Empire himself (by saving Anakin and being the inspiration for destroying the Emperor).

However, twenty years earlier, a young married couple looked up at the horizon and saw something completely different.

It seems Owen's misunderstanding of Luke was simply that. Owen did not want to be a wanderer. He had no interest in galactic matters. As long as he could live and work at his moisture farm, he was content. Beru, the farm, and knowing what each day would bring was Owen's idea of a dream come true.

Nevertheless, as Owen and Beru stood watching the suns sets with baby Luke in Beru's arms the couple knew that their lives could never be what they imagined. Owen would remain on the farm, but now it wasn't his choice, but to hide the son of Darth Vader. In the back of his mind he and Beru had to know that their lives, at any moment, could be disrupted by an Imperial Star Destroyer, or a garrison of Storm Troopers. As the Rebellion grew, certainly their anxiety raised with it. Obi-Wan Kenobi quickly became an unwelcomed guest as Owen wanted Luke to love nothing more than to continue on Tatooine; not because he hated the boy, as Luke must have estimated, but because he loved him and didn't want him becoming what Anakin had turned into.

As Beru and Owen looked up at the sunset on that first night of parenting Luke, perhaps the idea of Troopers coming and abolishing their home and lives was not far away. Maybe they imagine something that would unfold in two short decades. About that time Luke would look at to the sunsets himself and imagine adventure, but on that night Owen and Beru gazed upon it and thought of nothing but sacrifice.