According to the Persian Rivāyats (tr. Christensen, 1918-34, II, pp. 60-67), Jamšid was summoned before God himself and given kingship over the world with its insignia: the signet ring, the throne, and the diadem. Returning to earth, he came down from Mount Alborz, and people who looked in that direction are said to have seen two suns, one of which was Jamšēd. [...]
Because Eblis had stopped the benediction on the Great Nowruz (6 Farvardin), God told Jamšid to go to the land of Eblis and his companions. He was there until he had dealt with the problem, then came back and restored order, upon which he appeared as the sun, and people thought they saw two suns in the sky.