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From BoLT1; The Tale of the Sun and Moon” :

"Then said Manwë, looking upon the glory of that ship as it strained to be away: "Who shall steer us this boat and guide its course above the realms of Earth, for even the holy bodies of the Valar, meseems, may not for long endure to bathe in this great light."

"But a great thought came into the heart of Urwendi, and she said that she was not adread, and begged leave to become the mistress of the Sun and to make herself ready for that office as Ilúvatar set it in her heart to do. Then did she bid a many of her maidens follow her, even of those who had aforetime watered the roots of Laurelin with light, and casting aside their raiment they went down into that pool Faskalan as bathers into the sea, and its golden foams went over their bodies, and the Gods saw them not and were afraid. But after a while they came again to the brazen shores and were not as before, for their bodies were grown lucent and shone as with an ardour within, and light flashed from their limbs as they moved, nor might any raiment endure to cover their glorious bodies any more. Like air were they, and they trod as lightly as does sunlight on the earth, and saying no word they climbed upon the ship, and that vessel heaved against its great cords and all the folk of Valinor might scarce restrain it."

"....Manwë...spake to Urwendi and said: "Go now, most wondrous maiden washed in fire, and steer the ship of divine light above the world, that joy may search out its narrowest crannies and all the things that sleep within its bosom may awake". But Urwendi answered not, looking only eagerly to the East, and Manwë bade cast the ropes that held her, and straightway the Ship of the Morning arose above Taniquetil and the bosom of the air received it."

"Fionwë fled most readily, for he had conceived a great love for that bright maiden long ago, and her loveliness now, when bathed in fire she sate as the radiant mistress of the Sun, set him aflame with the eagerness of the Gods."