Surya yantra to worship when the planet sun is malefic in the birth chart of a person, Planet sun has been given special significance in the vedic astrology and the most powerful planet among all the nine planets. All other planets revolve around the sun. Sun is the chief of all the planets, people affected by it are aggressive , short tempered, proud and self respecting. person with a powerful sun in his horoscope is always able to achieve good name and fame in his life. A person with a weak sun in his horoscope suffers from diseases related to head and brain, heart, digestion eyes and sun stroke. Planet Sun represents power, authority and government. Worship of Sun through Surya Namaskar is always advised.