These Yagyas popularly called "Graha (loosely translated as planets, but this is not the same, as Sun is a star, not planet an Rahu & Ketu are only sensitive points, again not planets) Shanti" Yagyas are performed either to gain blessings of Grahas, which are benefic and pacify by propitiating the Grahas, which are malefic. Beneficence and malevolence of a particular Graha is decided by our panel of astrologers, after studying your horoscope, based on your birth details, or after studying the events surrounding your life.