Sarv Graha Puja denotes the nine celestial bodies which are central to astrological calculations (and beliefs) (and not the nine planets as it is frequently erroneously translated).
The Sun, the Moon, Mars, Mercury, Jupiter, Venus, Saturn and the two shadow planets Rahu and Ketu constitute the Sarv grahas.
The nine "grahas" or planets in our horoscope control our karma, our desires and their outcomes. Each of these nine planets exerts an influence in our lives, which is called "dasa" and it can be known from one's horoscope. Sarv Graha Puja is undertaken to reduce the negative effects and improve the positive energies related to a person.
Satisfaction, Peace, spiritual wisdom, humane feelings and all round progress is what an be achieved through Graha Shanti Anushthan. This helps in building an environment whereby the positive ambience is created within the environment and helps in fulfilling of specific intentions. The positive vibrations keep the evil forces at bay and hence brings in propserity and happiness within the family.