О природе
Among the named works attributed to "Zoroaster" is a treatise "On Nature" ("Peri physeos"), which appears to have originally constituted four volumes (i.e. papyrus rolls). The framework is a retelling of Plato's Myth of Er, with Zoroaster taking the place of the original hero. While Porphyry imagined Pythagoras listening to Zoroaster's discourse, "On Nature" has the sun in middle position, which was how it was understood in the 3rd century. In contrast, Plato's 4th-century BCE version had the sun in second place above the moon. Colotes accused Plato of plagiarizing Zoroaster, and Heraclides Ponticus wrote a text titled "Zoroaster" based on his perception of "Zoroastrian" philosophy, in order to express his disagreement with Plato on natural philosophy. With respect to substance and content in "On Nature" only two facts are known: that it was crammed with astrological speculations, and that Necessity ("Ananké") was mentioned by name and that she was in the air.