The 12 sons of Aditi are Mitra, Varuna, Aryaman, Daksa (also Daksha or Dhata), Bhaga, Ansha, Tvashtr (Tvashta), Savitr, Pusan (Pusha), Sakra, Vivasvat (Vivasvan) and Visnu (Vishnu). The 12 sons are also referred to as the 12 spokes of the sun's wheel, which represent the 12 months of the year.
Mitra is always mentioned with his twin Varuna. It is said that Mitra presides over the day while Varuna the night. Mitra is considered to be the god of the sun (or light) and Varuna the god of the moon.
Mitra is the master of knowledge. He is sleepless as he guards creation. He is the light that dispels darkness and promotes harmony, abundance, happiness and wisdom.