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Jantar Mantar in New Delhi is an astronomical observatory built by Maharaja Jai Singh II of Jaipur, a keen astronomer, with construction dated by tradition to around 1710 or, by some accounts, 1724. It was the first of five such observatories Jai Singh built across northern India, the others following at Jaipur, Ujjain, Varanasi and Mathura. The Delhi observatory consists of thirteen masonry instruments designed to measure time, track the positions of celestial bodies, and predict eclipses without the aid of any lenses or modern equipment.
Among the most prominent instruments at the site are the Samrat Yantra, a giant equinoctial sundial; the Jai Prakash Yantra; the Ram Yantra; and the Mishra Yantra, a composite instrument used for multiple observations. The observatory was thoroughly restored in 1901 and was declared a national monument in 1948. Today it is maintained by the Archaeological Survey of India, although accurate astronomical readings are no longer possible from the site owing to the tall buildings that now surround it in the heart of Connaught Place.
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