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A Jayaprakasa-yantra, or Jai Prakash Yantra, is an instrument of astronomy.

Some say it was invented by Sawai Jai Singh, the famous builder of observatories in the 1700s AD.[1]

Hartley says that the yantra can be used for finding the celestial latitude and longitude of the Sun. There are actually two Jayaprakasa at Jaipur; the red portions are passageways where an astronomer could stand to closely examine the shadow, and one Jaya was the reversed-image of the other. [1]


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