Nav Graha homa has the power to counter flaws in the horoscope and enable a person to prosper in life in case astrological defects are the main blocks to their well-being. The homa is done to worship the nine planets - Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn, Rahu, and Ketu. Every planet has its own importance.
Sun is the king of planets which gives health. Moon is the planet that rules over mind and gives success. Mars or Mangala is the planet which gives prosperity and wealth. Mercury is the planet that gives knowledge, Jupiter gives education, Venus gives the knowledge of art, music, etc. Saturn gives happiness and also teaches vairagya. Rahu makes the life stronger. Ketu helps the family prosper.