Okay, about the sun argument, what Sephiroth does is he summons a comet that came from another galaxy. That comet busts multiple planets on its journey; then it crashes into the sun resulting in a supernova. A supernova isn't simply pushing the sun into your enemy, it's destroying the sun and causing it to explode into a blast millions of times greater than the sun's size. Pushing the sun into your enemy, assuming it were the size of the real sun, at FTL speeds would just be Star level; and ironically, doing it at Relativistic+ speeds would result in a higher rating.
But yeah, it's better to calc the lighthouse Earthquake feats for their ratings at the time being. Judgement just shows light shining on certain areas, no proof that it covers the entire planet as @Ant mentioned.