What natural phenomenon does the myth Phaethon explain?

The myth of Phaethon explains the natural phenomenon of the sun’s movement across the sky. In the story, Phaethon, the son of HeliOS (the sun god), attempts to drive his father’s chariot but loses control, causing chaos and scorching the Earth. This tale metaphorically illustrates the sun's powerful and sometimes unpredictable nature, reflecting ancient attempts to understand celestial movements and natural disasters associated with extreme heat.