In Astrology, the South Node of the Moon is called KETU. After the head of Svarbhanu, an Asura, was cut off by God Vishnu, his head and body joined with a snake to form 'Ketu', representing the body without a head, and Rahu, representing the head without a body. Ketu is generally referred to as a "shadow" planet. It is believed to have a tremendous impact on human lives and also the whole creation. The planet Ketu is a cruel planet although it has a spiritual aspect to it as well. It is also responsible for various kinds of mishappenings in life especially those incidents which occur suddenly like accidents etc. fire, accidents or injury, renunciation, bad nature to have pleasure with other ladies, sour experience, salvation, punishment, imprisonment, fear complex and allergy are attributed to Ketu.
Ketu Graha Shanti Havan protects a person from these effects: