If all the 7 planets are situated between Rahu and Ketu then Kaal Sarp Yog is formed. According to the situation of Rahu in 12 houses of horoscope there are Kaal Sarp Yogas of 12 types. These are : Anant, Kulik, Vasuki, Shankhpal, Padma, Mahapadma, Takshak, Karkotak, Shankhchud, Ghaatak, Vishdhar Sheshnag. The Kaal Sarp Yog is of two types- Ascending and Descending. If all the 7 planets are eaten away by Rahu's mouth then it is Ascending Kaal Sarp Yog. If all planets are situated in back of Rahu then Descending Kaal Sarp Yog is formed.