I prefer it coming out of the sunset (sunrise?). Going into the sunset is an image of a hero who's finished and is on the way out. This image of the ship coming from the light could be read symbolically as the Enterprise's mission being backed by noble ideals and lofty standards. It's an image of the ship going forth.
Very well said. Itīs good to know there are still fans out there, that donīt think Star Trek is just about action, space battles and powerful warships.