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Yanthras were originated in ancient India. It is painted in the roofs/walls of temples. It is believed that Yanthras hold many secrets and it is having occult powers. Fifty years ago we had nothing to compare with it. Now it can be compared with computer motherboards. May be that ancient Rishis who created it are more advanced than us. In "Mahabharat" epic there are two things which has no parallel till now. One is "Sudarshana Chakra" of Sree Krishna and the second is "Divya Chakshus" given to Sanjaya, the servent of King Dhritharastra (father of Kauravas). Sudarsana Chakra is having the power to destroy any target and return to the owner, namely Sree Krishna. The whole Mahabharat war was seen&heard by Sanjaya far away from the battle field and described it to King Dhritharastra. Before the invention of TV we were not having any comparable thing to Divya Chakshus. Now, mobile phone with video camera and network connection is very close to it. Ten or twenty years from now on we may also have an instrument resembling Divya Chakshus ( Special eye).
Ganesh Yanthra and Gann Vibration table are given above. Eight petals around a circle and the inside triangle is sufficient to get the figures seen in Gann vibration table ( 1/8, 2/8, 3/8, 4/8, 5/8, 6/8, 7/8, 8/8 & 1/3, 2/3, 3/3). Many other things are in the yanthra which we will know only after so many years.