In manuscripts the setting sun, devoured by the earth, is opposite Xolotl's image. Quetzalcoatl and Xolotl constitute the twin phases of Venus as the morning and evening star, respectively. Quetzalcoatl as the morning star acts as the harbinger of the Sun's rising (rebirth) every dawn, Xolotl as the evening star acts as the harbinger of the Sun's setting (death) every dusk. In this way they divide the single life-death process of cyclical transformation into its two phases: one leading from birth to death, the other from death to birth.