The oldest Indian scripture, the Rig Veda, describes Surya in a Vedic mantra as the ultimate source of light as well as the origin of the universe. So who is Surya Dev? He is the god of the sun. The sun is the ultimate source of energy and life on Earth. If worshipped on a Sunday he will grant your wishes, worship him daily and be blessed with success, health and prosperity. He can remove all kinds of problems in life.