In the opening shot of The Force Awakens, we see the Star Destroyer Finalizer slowly obscure a planet that we assume is Jakku. We then see several small ships (that turn out to be transporters full of Stormtroopers) leave the Star Destroyer and head.. toward the camera?
If they're heading toward the camera, and that's Jakku, they're heading away from Jakku. So that can't be Jakku, it must be.. a moon? Another planet?