In ancient Indian mythology, the eclipse was said to be Rāhu eating the Sun or Moon. Later on, Vedic astronomers understood that eclipses occur when the Moon crosses through the ecliptic at one of it's two orbital nodes, while simultaneously being in line with the Earth, causing a shadow. Thus the ascending node of the moon was sometimes referred to as Rāhu.
Āryabhaṭa I wrote of the Moon's shadow causing solar eclipses. Eclipses are also mentioned in the Pauliśa Siddhānta, the Romaka Siddhānta, the Saura Siddhānta, and the Vāsiṣṭha Siddhānta. The Vāsiṣṭha of Varāhamihira's Pancasiddhāntikā gives calculations regarding the lunar eclipse. 
- Pāta (Lunar nodes)
- An Animation of the Motion of the Moon around the Earth Illustrating the Occasions of Solar and Lunar Eclipse, Charles Hartley, Hartwick College.