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This is the Samrat Yantra, the largest sundial in the world (90 feet high), it can be used to tell the time to an accuracy of about two seconds in Jaipur local time.

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Curved Stairs at Dusk, Jantar Mantar - India Jantar Mantar was built by Maharaja Jai Singh II in 1724. It was built to observe and compile astronomical tables which would be used to predict the times and movements of Sun, Moon and other planets.

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