https://www.dekut.com/Health/budh-yantra-india-etched-plated-yantra-mercurybudh/ Budh Yantra India - The great phase of mercury lasts for 17 years. For the pacification of this planet fasts should be observed on every Amavasya (moonless night). The worship of mercury is done when it is situated in the northeast direction. Tue, 24 Jul 2012 06:32:13 UTC en