§ Of the Sun and Moon and the Hiding of Valinor The Silmarillion

Still therefore, after the Long Night, the light of Valinor was greater and fairer than upon Middle-earth; for the Sun rested there, and the lights of heaven drew nearer to Earth in that region. But neither the Sun nor the Moon can recall the light that was of old, that came from the Trees before they were touched by the poison of Ungoliant That light lives now in the Silmarils alone.