Built by Maharaja Jai Singh II of Jaipur in 1724 and located in New Delhi area, this structure has 13 architectural astronomy instruments, used to compile astronomical tables, and to predict the times and movements of the sun, moon and planets. Jantar mantar contains Samrat Yantra, the Jayaprakash Yantra, and the Misra Yantra.The Samrat Yantra is basically an equal hour sundial which is 70 feet high and also has a 128 foot long hypotenuse that is parallel to the Earth’s axis and points toward the North Pole. There is a quadrant with graduations indicating hours, minutes, and seconds.The Jayaprakash yantra has hollowed out hemispheres with markings on their concave surfaces used to align the position of a star. The Misra Yantra is used to determine the shortest and longest days of the year and also to specify the exact moment of noon in other cities and locations apart from Delhi.
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