Understand a couple points, God made the lessor light moon and the greater light SUN. These are projections of light not bodies of light. We only see one side of such circular objects in the dome. NASA will BS you and say we actually see the other side of Sun, but we can't. They make up the hocus pocus dynamic sun story that it changes so it never looks the same, true but only the one circular side God shows us. As the Sun sets or passes low on the horizon, God designed the molten dome in such a way as to obscure the suns rays making it look as though it passes below the horizon. He's done a great job.