What to read after Understanding Rahu and Ketu Spiritually?

The myth behind the shadow planet Rahu speaks of the Asura Swarbhanu, who was a dragon. He was sundered during the churning of the Ocean of Milk, wherein the last gift was amrita, the nectar of immortality.

The demons and the gods had agreed to co-operate and churn the ocean of milk in order to receive the precious gifts it had. They would take the gifts - but the demons engaged in subterfuge and obtained the last gift - the pot containing the nectar of immortality. The gods, outraged, called to Lord Vishnu for aid.

Lord Vishnu took the disguise of an enchantress, Mohini. This enchantress prevented the demons from drinking the pot of amrita, and made arrangements to divide the pot between the gods and the demons. The enchantress fooled the demons with her beauty and sweet endearments, whilst feeding the contents of the pot to the gods. Swarbhanu was not fooled; he had clearer perception, took a disguise and sat among the gods and was given a taste of the nectar. The Sun and the Moon, saw the deception and informed Vishnu, who promptly took off Swarbhanu's head with his discus. The body fell down dead (and was later revived as Ketu); the head had tasted immortality and continued to live. It is said that Rahu seeks revenge by "swallowing" the Sun and Moon from time to time - this is the explanation for occurrence of eclipses.