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jaiprakash yantra Jai Prakash Yantra, which is an invention of Maharaja Sawai Jai Singh, is the most accurate, interesting, and educative among all the instruments of observatory. It will not be extravagant to say that this was an instrument which was built at last, so that he could verify the readings and calculations of other instruments. They were rectified with the help of it.

The instrument is nothing but the cavity divided into two parts, each one complimentary to other. The cavity is nothing but the upside down of the earth. 

Jai Prakash Yantra

It has been divided into two parts, so that the measurer could go inside and calculate the readings accurately. The foundation has lead sheetings so that the various seasons donot affect the readings. Each of these two cavities are divided into six marble slabs, divided further into minutes and seconds. They are also bearing the inscriptions of twelve symbols of zodiac. In the middle of the instrument a ring is hanging with the help of the wires

It is an ideal instrument for demonstrating the the so called "doctrine of sphere" and showing to the eye, the apparent motions of the Sun, and would be great educational value to all commencing the study of astronomy. The marble slabs are alos introduced for the zodiac sysmbols.

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