Pitra Dosha Shanti Puja- When Surya and Rahu are located at the ninth house, it is believed that Pitra Dosha Yoga is being created. According to the shastra, in whichever house the Sun and Rahu both located, all the results of that house are destroyed. There is such a dosha in the horoscope of a person who has the ability to give all these sorrows together, this defect is known as Pitra Dosha.
The ninth house of the horoscope is called the house of religion, it is also the house of the father. If in any way the ninth house is afflicted by bad planets, it indicates that the wishes of the ancestors were left unfulfilled.