Vishnupurana 3.2.7

3.2.7

vājirūpadharaḥ so 'pi tasyāṃ devāv athāśvinau
janayām āsa revantaṃ retaso 'nte ca bhāskaraḥ //

PARÁŚARA.--Sanjná, the daughter of Viśwakarman, was the wife of the sun, and bore him three children, the Manu (Vaivaswata), Yama, and the goddess Yamí (or the Yamuná river). Unable to endure the fervours of her lord, Sanjná gave him Chháyá as his handmaid, and repaired to the forests to practise devout exercises. The sun, supposing Chháyá to be his wife Sanjná, begot by her three other children, Śanaiśchara (Saturn), another Manu (Sávarńi), and a daughter Tapatí (the Tapti river). Chháyá, upon one occasion, being offended with Yama, the son of Sanjná, denounced an imprecation upon him, and thereby revealed to Yama and to the sun that she was not in truth Sanjná, the mother of the former. Being further informed by Chháyá that his wife had gone to the wilderness, the sun beheld her by the eye of meditation engaged in austerities, in the figure of a mare (in the region of Uttara Kuru). Metamorphosing himself into a horse, he rejoined his wife, and begot three other children, the two Áswins and Revanta, and then brought Sanjná back to his own dwelling. To diminish his intensity, Viśwakarman placed the luminary on his lathe, to grind off some of his effulgence; and in this manner reduced it an eighth, for more than that was inseparable. The parts of the divine Vaishńava splendour, residing in the sun, that were filed off by Viśwakarman, fell blazing down upon the earth, and the artist constructed of them the discus of Vishńu, the trident of Śiva, the weapon of the god of wealth, the lance of Kártikeya, and the weapons of the other gods: all these Viśwakarman fabricated from the superfluous rays of the sun.