In hinduism terms the difference between indra and surya

is that indra is the god of war and weather; also the King of the Gods or Devas and Lord of Heaven or Svargaloka in Hinduism while surya is the chief solar deity, one of the Adityas, son of Kasyapa and one of his wives Aditi, of Indra, or of Dyaus Pita (depending by the versions). Portrayed with golden arms and hair, Surya drives through the heaven in his triumphal chariot harnessed by seven horses or one horse with seven heads, which represent the seven colours of the rainbow or the seven chakras.