Ketu (mythology)
…Personified as a deity, Rāhu (, the ascending (i.e. 'north') lunar node) and Ketu are considered to be the two halves of the immortal asura (demon) Svarbhanu, who was beheaded by the God Vishnu. As per Vedic astrology, Rāhu and Ketu have an orbital cycle of 18.6 years and are always 180 degrees from each…