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|South Lunar Node|
Ketu:Tail of Demon Snake, sculpture from the British Museum
|Mantra||"Kethum gruhnvan akethave"|
Ketu (Sanskrit: केतु, IAST: Ketú) () is the descending lunar node. 'Ketu' is said to be the body of Rahu, after the head of the asura was cut off by God Vishnu. According to some accounts in Hindu mythology, Ketu belongs to Jaimini Gotra, whereas Rahu is form Paiteenasa gotra and hence both are totally different entities with distinct characteristics and not two parts of a common 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. In some special circumstances it helps someone achieve the zenith of fame. Ketu is often depicted with a gem or star on his head signifying a mystery light.
Astronomically, Ketu and Rahu denote the points of intersection of the paths of the Sun and the Moon as they move on the celestial sphere. Therefore, Rahu and Ketu are respectively called the north and the south lunar nodes. The fact that eclipses occur when the Sun and the Moon are at one of these points gives rise to the myth of the swallowing of the Sun and the Moon by the demon snake.
In ancient Tamil astrological scripts, Ketu was considered as incarnation of Indra. During a war with Asuras, Indra was defeated and took a passive form and a subtle state as Ketu. Indra spent this time realizing his past mistakes, and failures and that lead to spirituality towards Lord Shiva.
In Hindu astrology Ketu represents karmic collections both good and bad, spirituality and supernatural influences. Ketu is associated with the Meena Avatar (Fish Incarnation) of Vishnu. Ketu signifies the spiritual process of the refinement of materialization to spirit and is considered both malefic and benefic, as it causes sorrow and loss, and yet at the same time turns the individual to God. In other words, it causes material loss in order to force a more spiritual outlook in the person. Ketu is a karaka or indicator of intelligence, wisdom, non-attachment, fantasy, penetrating insight, derangement, and psychic abilities. Ketu is believed to bring prosperity to the devotee's family, removes the effects of snakebite and illness arising out of poisons. He grants good health, wealth and cattle to his devotees. Ketu is the lord of three nakshatras or lunar mansions: Ashvini, Magha and Mula.
The people who come under the influence of Ketu can achieve great heights, most of them spiritual.
In his wife Siḿhikā, Vipracitti begot one hundred and one sons, of whom the eldest is Rāhu and the others are the one hundred Ketus.