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Jantar Mantar – Indian Observatory still works with the Sun

Jantar Mantar – Indian Observatory still works with the Sun

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The Jantar Mantar is an equinoctial sundial, consisting of a gigantic triangular gnomonwith 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 Mantars in India, of which the largest is in Jaipur which features many instruments along with the world’s largest stone sundial.[1] At present only four Jantar Mantar exist, the Jantar Mantar at Mathura was torn down just before Revolt of 1857. The Vrihat Samrat yantra is a sundial that can give the local time to an accuracy of 2 seconds.[2] It is a UNESCO World Heritage Site.

History :
In the early 18th century, Maharaja Jai Singh IIof Jaipur constructed five Jantar Mantar in total, in New Delhi, Jaipur, Ujjain, Mathura and Varanasi; they were completed between 1724 and 1735.

The Jantar have like Samrat Yantra, Jai Prakash, Ram Yantra and Niyati Chakra; each of which are used to for various astronomical calculations. The primary purpose of the observatory was to compile astronomical tables and to predict the times and movements of the sun, moon and planets .

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