Kaal Sarp Dosh or yog is a serious condition in one's horoscope. As per Hindu astrology, when all the seven planets are hemmed between the shadow planets Rahu and Ketu, Kaal Sarp Yog is formed. Rahu is the serpent's head while Ketu is the serpent's tail. The presence of Kaal Sarp Yog in one's horoscope is very harmful. It harms every aspect of the individual's life.