Once on a time as the gods and Danavas were fighting each other in the dark, Rahu pierced both the Sun and Moon with his arrows.
घोरे तमस्ययुध्यन्त सहिता देवदानवाः। अविध्यत शरैस्तत्र स्वर्भानुः सोमभास्करौ॥