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It is Jantar Mantar. They are located in Delhi, Ujjain, Varanasi, Jaipur and Mathura.
Between 1724 and 1730 Maharajah Sawaii Jai Singh II of Jaipur constructed five astronomical observatories in northern India. The observatories, or "Jantar Mantars" as they are commonly known, incorporate multiple buildings of unique form, each with a specialized function for astronomical measurement. These structures with their striking combinations of geometric forms at large scale have captivated the attention of architects, artists, and art historians world wide, yet remain largely unknown to the general public.
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Jantar Mantar
The Jantar Mantar is an equinoctial sundial, consisting of a gigantic triangular gnomon with the hypotenuse parallel to the Earth's axis. On either side of the gnomon is a quadrant of a circle, parallel to the plane of the equator. The instrument is intended to measure the time of day, correct to half a second and declination of the Sun and the other heavenly bodies. There were five Jantar mantar in India, of which the largest is in Jaipur which features many tpes of instruments along with the world's largest stone sundial.[1] At present only four Jantar Mantar exist, as the Jantar Mantar at Mathura was torn down just before Revolt of 1857.
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