Guru Yantra or Brihaspati Yantra is to appease the planet Jupiter/ Brihaspati. When Jupiter is malefic, the use of this yantra is very benefic and favorable. Guru Yantra is to be kept on a Thursday in your Puja Ghar (place of worship). This Yantra negates the malefic effects of planet Jupiter and bestows power, rank and authority. Guru Yantra is best for profession and business.