Brahmā said:
1-3. The two rivers Aruna and Varunā are very auspicious. Their confluence with Ganga is also very holy, O excellent sage.
They bestow merit more than the lake Mānasa, the holy centre Prayāga and the river Mandakini. Listen now to its origin which destroys all sins.
The eldest son of Kaśyapa, Aditya, is well known in the worlds. He is the eye of the three worlds. He has hot and powerful rays. He has seven horses to draw his chariot. He is honoured by the people of the world. Uşa, the daughter of Tvaştr, was well known as the most beautiful woman in the three worlds.
4. Unable to endure the severity of the heat of her husband, the beautiful woman of good waistline thought, "What should be done by me?”
5. The extremely intelligent Manu and Yama were her sons born of Vivasván (Sun). The holy river Yamunā (too was her daughter). Listen to that incident which caused surprise.
6-8. She created her own shadow strenuously in the form of herself. Uşã then said to her:
"Be like me. At my bidding, look after my husband and children. Till I come back, be the beloved of my husband. Neither to my children nor to my husband should you reveal this fact".
“So be it", said the shadow.
Uşă went out of her abode.
9. After saying this she went ahead, desirous of peaceful form. After going home Uşā mentioned everything to her father. Tvastr was surprised. Being fond of his daughter he said to her:
Tvaştr said:
10. It is not proper on the part of a married woman to do as she pleases. How do your children and husband do? O gentle lady, I am afraid I may be considered uncultured. Go back to your husband's abode once again.
Brahmā said:
11. Thus urged by her father she said "No, No' again and again. She went to the Northern Kuru country for performing penance.
12. There she assumed the form of a mare and performed a severe penance. Uşă steadily meditated upon her husband who was too fierce to be looked at.
13. In the meantime, O dear one, the shadow Chāyā who had assumed the form of Uşa, cohabited with her husband. Children were born to her.
14-17. (The sons were) Manu Săvarņi and Sani. Viști, a wicked daughter, was also born. Chāyā behaved differently to her own children and the children of Uşa. Yama therefore became angry. Yama the lord of southern quarter kicked his step. mother Chàya, who was behaving differently. In her excitement due to the wickedness of her step-son Chāyā cursed Yama, son of the Sun god.
“O sinner, may your foot become putrefied at my bidding." With his foot putrefied he went to his father crying. He informed Savitr of the entire episode.
Yama said:
18-21. O excellent Deva, she is not my mother because I have been cursed by her thus. A (true) mother never gets angry even if children act against her wish. I might have uttered something due to my stupidity. I might have done something mischievous. If she had been my mother she would not have become angry. Hence she is not my mother.
Mother is so called because everything child does, whether good or bad, becomes measured in her. O dear father, she stares at me everyday as though she would burn me. She speaks to me with words as ferocious as black fire. She is not my mother.
Brahma said:
22-24. On hearing this from his son Sun began to think (and understood). "This is Chåyå and not Uşa. Desirous of quietening me she is engaged in penance. The daughter of Tvaştr is in the northern Kuru in the form of a mare."
On coming to know that she was there Lord Sun went thither where his wife was staying. He himself assumed the form of a horse.
25-28. On seeing her in the form of a mare, the sun in the form of a horse rushed at her. On seeing the horse excited by passion and on hearing the sound, Uşă the chaste lady hurriedly. fled to the South. She had been meditating on her husband. She was afraid of being attacked by the horse. She did not know who it was. When the husband approached her she fled to the South in great hurry. "Who will be my saviour now, the sages or the Devas?" She thought herself. The sun in the form of a horse pursued his beloved who was running fast. Wherever Uşå went the sun also went there.
29-31. If anyone comes under the influence of Cupid, what wicked thing docs he not do? Facing the southern direction they crossed Bhagirathi, Narmadā and other rivers, parks, forests and Vindhya mountain. Distressed with fear, the daughter of Tvaştr went to Gautami because she had heard that in Janasthana there were sages who could protect her. After entering Gautami, the mare went to the hermitage of sages.
32. The horse too came there. It was the Sun in that form. People who were staying in Janasthāna stopped that horse. Lord Sun, the husband of Uşa, then cursed them in anger.
The Sun said:
33-36. Since you stopped me you will become banyan trees. Brahma said:
By their eye of knowledge the sages saw that he was the husband of Uşă. Thereupon they eulogized the lord of Devas in great delight.
Even as he was being culogized by the sages the Sun approa- ched the mare sexually. The face of the horse came into contact with the face of the mare. After realising that it was her husband, the daughter of Tvastr shed the semen from her month. From their semen the Asvins were born in the river Ganga.
37-40. The following persons came there, viz. groups of Devas, Siddhas, sages, rivers, cows, medicinal herbs, groups of luminaries, holy chariot of the seven-horsed lord (i.e. Sun), Aruņa the charioteer of the Sun, Yama, Manu, Varuna, Sani son of the Sun god, the holy river Yamuna, Tapi, Mahanadi and father-in-law of the Sun (i.e. Tvaştr). O sages, out of wonder, the rivers had assumed their respective forms. They came there to see this wonderful event. On realising his purpose Sun spoke to his father-in-law.
The Sun said:
41. O Tvaştı, mount ine on to the lathe and chisel off my splendorous parts for pleasing Uşā who has performed excellent penance. O Prajāpati, you cut off ny parts until she finds herself pleased.
Brahmä said:
42. After saying "So be it", Tvaştr began to cut off the splendorous parts of the Sun in the presence of Somanātha. They know it as Prabhasa.
43-47. The place where Ușă in the form of a mare came into contact with her husband, the place where Aśvins were born, is called Aśvatirtha.
It is also called Bhānutirtha where there is the hermitage with five banyan trees. Tāpī and Yamună came there to see their father (i.e. the Sun). The confluence of the rivers Aruņā and Varuņå with the Ganga is splendid.
There are nine times three thousand (i.e. 27000) holy centres of Devas there severally pertaining to Devas who had come to that holy centre. All these holy centres are good. Ablution performed and charitable gifts distributed there bestow great and everlasting merit.
O Narada, by remembring, reading and listening to this, man beconies rid of all sins. He becomes virtuous and happy.
Summary of chapter 19 of the Brahma Purana is as follows:
The legend of Sūrya's wife Uṣā (daughter of Tvaṣṭr, here called Saṃjñā) is narrated. Unable to bear Sūrya's brilliance, she creates a shadow form (Chāyā) and retreats to the northern Kuru region in the form of a mare. Sūrya pursues her in horse form; the twin Aśvins are born from their union in Gautamī's waters. Tvaṣṭr then trims Sūrya's excess splendour on his lathe. The rivers Aruṇā and Varuṇā flow from this event, and the spot is hallowed as Aśvatīrtha or Bhānutīrtha.