If,in a horoscope, all the planets are placed between Rahu and Ketu, it is considered to be a Kaalsarpa yoga. According to Indian astrology, there are many types of Kaal Sarpa yogas are there. Some one having a Kaalsarpa Yoga in the horoscope faces different kinds of problems and instability in the life, bereft of progeny, mental disturbance etc. This condition is generally considered to be adverse, but can be relieved through a Kalasarpa puja. It is mandatory to do the Puja.( Ideal to do once in a year around birth day)