Sanjna Devi

Sanjna Devi mostly known as Saranyu is the First wife of Surya and the mother of Yama, Yamuna, Manu, the Ashwini Kumaras and Revanta. She is the daughter of Vishwakarma. She is the goddess of cloud and dusk.

Birth
Sanjna Devi was born to Vishwakarma and Gritachi in Vishwakarma loka. It is said that she was the twin sister of Trisiras and Chaaya Devi is her reflection.

Marriage
It is said that Vivaswan who is Surya fell in love with her and married her.

An uncomfortable married life
However, her marital life wasn't good as Surya couldn't look at Sanjna because of his scorching heat. Meanwhile Sanjna feels uncomfortable with Surya due to the same reason. This angers Surya and curses her next born Children. After the birth of Yama and Yami she is unable to tolerate and abandons Surya.

Chaaya's entry
However, after she reaches a pond she gives life to her reflection and names her Chaaya Devi (Shadow) thus, creating a doppelganger of her. Chaaya returns to Surya who is delighted on seeing her thinking that she is sanjna. Many months latr, Chaaya gives birth to Shani. She takes good care of Shani but she treats Sanjna's children badly. Yama and Manu were angry but still they adjusted. One day, Yamuna/Yami commits a mistake, an enraged Chaya beats her up. Yama and Manu is now unable to tolerate and complains this to their father, Surya. Surya is suspicious and interrogates Chaaya. Chaaya reveals the truth.

Birth of Ashvins
Surya is distressed and guilty on hearing this, he goes to his father in-law to decrease his heat. Vishwakarma chisels his heat. This makes him pleasent. Surya then locates Samjna, who was in the form of a mare, and after finding her, he assumes the form of a stallion and engage in love making with her in the form of a stallion. Samjna delivers twins Ashvins through her nose. Surya shows his normal form to her. Sanjana is pleased to see her husband's beauty and returns to her abode with her new-born twins. Unlike the previous version of Harivamsa, Markandeya Purana states that Surya asks his father in law to reduce his heat after the birth of Ashvins. Some texts also add Revanta, the divine master of horses, as the son of Sanjana.

Etymology and Epithets
Saraṇyū is the female form of the adjective saraṇyú, meaning "quick, fleet, nimble", used for rivers and wind in the Rigveda (compare also Sarayu). Saranyu has been described as "the swift-speeding storm cloud". In the later text named Harivamsa (5th century C.E.), Saranyu is known as Sanjna or Samjna (pronounced. Sangya), which means 'image', 'sign' or 'name'. In the Puranas, Samjna is known by many other names including Sandhya, Sanjana and Suvarchala.