Among the deities of celestial light, those most frequently invoked are the twin gods of morning named Açvins. They are the sons of Heaven, eternally young and handsome. They ride on a car, on which they are accompanied by the sun-maiden Sūryā. This car is bright and sunlike, and all its parts are golden. The time when these gods appear is the early dawn, when "darkness still stands among the ruddy cows." At the yoking of their car Ushas is born.
Many myths are told about the Açvins as succouring divinities. They deliver from distress in general, especially rescuing from the ocean in a ship or ships. They are characteristically divine physicians, who give sight to the blind and make the lame to walk. One very curious myth is that of the maiden Viçpalā, who having had her leg cut off in some conflict, was at once furnished by the Açvins with an iron limb. They agree in many respects with the two famous horsemen of Greek mythology, the Dioskouroi, sons of Zeus and brothers of Helen. The two most probable theories as to the origin of these twin deities are, that they represent either the twilight, half dark, half light, or the morning and evening star.
In the realm of air Indra is the dominant deity. He is, indeed, the favourite and national god of the Vedic Indian. His importance is sufficiently indicated by the fact that more than one-fourth of the Rigveda is devoted to his praise. Handed down from a bygone age, Indra has become more anthropomorphic and surrounded by mythological imagery than any other Vedic god. The significance of his character is nevertheless sufficiently clear. He is primarily the thunder-god, the conquest of the demon of drought or darkness named Vṛitra, the
