The Ashvins or Ashwini Kumaras (Sanskrit: अश्विन aśvin-, dual aśvinau), in Hindu mythology, are divine twin horsemen in the Rigveda, sons of Saranya (daughter of vishwakarma), a goddess of the clouds and wife of Surya in his form as Vivasvat. The Ashvins are Vedic gods symbolising the shining of sunrise and sunset, appearing in the sky before the dawn in a golden chariot, bringing treasures to men and averting misfortune and sickness. They can be compared with the Dioscuri (the twins Castor and Pollux) of Greek and Roman mythology, and especially to the divine twins Ašvieniai of the ancient Baltic religion.
They are the doctors of gods and are devas of Ayurvedic medicine. They are called Nasatya (dual nāsatyau "kind, helpful") in the Rigveda; later, Nasatya is the name of one twin, while the other is called Dasra ("enlightened giving"). By popular etymology, the name nāsatya was analysed as na+asatya "not untrue"="true".
The Ashvins avin- "possessor of horses", "horse tamer", "cavalier", dual avinau or Ashwini Kumaras are divine twin horsemen mentioned in the Rigveda. They are twins with head of a horse but the rest of the body of human beings; Lord Brahma granted them the boon that they will be extremely handsome and will have knowledge of Ayurveda.
Ashvini is the name of an asterism in Indian astronomy, later identified with the mother of the Ashvins. This asterism forms the first of the 27 asterisms that form the zodiac in Indian astronomy. This star is identified as Hamal (Alpha Arietis), the brightest star in the constellation of Aries.
The Ashvins are mentioned 376 times in the Rigveda, with 57 hymns specifically dedicated to them: 1.3, 1.22, 1.34, 1.46-47, 1.112, 1.116-120 (c.f. Vishpala), 1.157-158, 1.180-184, 2.20, 3.58, 4.43-45, 5.73-78, 6.62-63, 7.67-74, 8.5, 8.8-10, 8.22, 8.26, 8.35, 8.57, 8.73, 8.85-87, 10.24, 10.39-41, 10.143.
See also 
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