Poreatsiri, the sun, is the luminous son born of the moon Kashiri and his human wife. In the birth of the celestial bodies the eldest child shone with such heat that he scorched the earth and could not be kept upon it, and so he rose to take his place in the sky as the sun that lights and warms the world. Fuller tellings pair him with brothers of graded brilliance, among them the pale sun of the underworld and the firmament whose glow is the light of the stars, while the planet Venus is reckoned another of the moon's sons. The sun's daily passage from his rising place in the east to his setting in the west frames Matsigenka reckoning of time, and his name, built on the root for shining, is simply the everyday word for the sun.