In each and every planet there is a predominating deity. It is understood from Bhagavad-gita that in the sun there is a predominating deity named Vivasvan. Similarly, there is a predominating deity of the moon and of the various planets. Actually the predominating deities in all the other planets are descendants from the predominating deities of the sun and moon. On this planet earth there are two ksatriya dynasties, and one comes from the predominating deity of the sun and the other from the predominating deity of the moon. These dynasties are known as Surya-vamsa and Candra-vamsa respectively. When monarchy existed on this planet, the chief member was one of the members of the Surya dynasty, or Surya-vamsa, and the subordinate kings belonged to the Candra-vamsa. However, Maharaja Prthu was so powerful that he could exhibit all the qualities of the predominating deities in other planets.