Ketu is known as the Tail of the snake God. When Lord Vishnu’s Sudarshan Chakra divided Svarbhanu (the snake demon or God) into two parts then he named his tail as ketu. According to Hinduism Ketu is considered as the Karmic collection of both Bad and Good deeds. He is also known as the collection of spirituality and supernatural influences.
Ketu is considered as Karaka which means indicator of intelligence, wisdom, non-attachment, fantasy and psychic abilities. According to Holy books it is believed that ketu is responsible for people’s self realization, ganana or their wavering nature which leads them to the path of moksha. Some sages said that it is the effect of ketu which made a human being to follow the path of God, as a result they became sanyasi.
According to an astrology text Barihat Parashara Ketu is related to Matasya which mean Fish. Ketu’s body has tail of fish instead of legs which relate him with fishes. According to some old astrologers Ketu is exalted in Scorpio and deliberate in Taurus. But according to modern astrology Ketu is exalted in Sagittarius and deliberate in Gemini.
As stated by Jyotish Shastra Ketu is beneficial for Sagittarius and harmful for Gemini. People who born with the benefic rashi of Ketu are believed to achieve great heights in the life weather its money, relations or career. And people who born with the malefic rashi of Ketu has to suffer so many problems in their lives. They supposed to have very serious problems like accidents, depression, anxiety, ghost related problems or paranormal activities, loss of property etc.
If a person is born with bad Rahu and Ketu both, they believed to suffer Kala Sarpa Dosha which can even became a reason of their early death. People with bad ketu are advised to do Ketu Graha Shanti puja by the priests. They have to worship Ketu for their whole files. Ketu is believed to bless his devotees with prosperity, remove effects of snakebite from them and their families as well as it gave them strength to fight their illness.