Vishnupurana 3.2.p2

3.2.p2

Parāçara said Sanjnā, the daughter of Viswakarman, was the wife of the sun, and bore him three children, the Manu Vaivaswata, Yama and the goddess Yami. Being unable to endure the fervours of her husband, she engaged Chāya in his attendance and repaired to the forest to practise devout austerities. Considering that Chāya as Sanjnā, he got upon her three other children—Sanaischra (Saturn) another Manu Sāvarni and a daughter Tapati. Once on a time being offended with Yama, the son of Sanjnā, Chāya imprecated a curse upon him and gave out to Yama and the sun that she was not in reality Sanjnā the mother of the former. (Having heard this) the sun, by his meditation saw her as a mare in the region of Uttara Kuru.