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Ram  Yantra

Ram Yantra, as it represents by its name, is an instrument, which is very helphul to the astronomers to find out the zenith distance and the altitude of the sun. The beauty of the instrument is, that it givs us direct readings. Basically the instrument consists of two circular stone building. If we unite them together, it becomes one instrument. This way one is complimentary to the other. They are constructed at a resonable distance. In the center of the instrument a prependicular rod is fixed, which is of the same height of the building itself.

Twelve stone triangles are fixed above the ground. These triangular stone slabs are graduated from 90 degree to 45 degree, while 45 to 0 degree the graduations are on the circular wall.  This is an instrument by which we come to know the movement of stars.