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en.wikipedia.org/wiki/Jantar_Mantar,_New_Delhi
Jantar Mantar is located in the modern city of New Delhi. "Jantar Mantar" means "instruments for measuring the harmony of the heavens".[1] It consists of 13 architectural astronomy instruments. The site is one of five built by Maharaja Jai Singh II of Jaipur, from 1723 onwards, revising the calendar and astronomical tables. Jai Singh, born in 1688 into a royal Rajput family that ruled the regional kingdom, was born into an era of education that maintained a keen interest in astronomy. There is a plaque fixed on one of the structures in the Jantar Mantar observatory in New Delhi that was placed there in 1910 mistakenly dating the construction of the complex to the year 1710. Later research, though, suggests 1724 as the actual year of construction. Its height is 723 feet (220 m).
The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets. Some of these purposes nowadays would be classified as astronomy.
Completed in 1724, the Delhi Jantar Mantar had decayed considerably by 1857 uprising. The Ram Yantra, the Samrat Yantra, the Jai Prakash Yantra and the Misra Yantra are the distinct instruments of Jantar Mantar. The most famous of these structures, the Jaipur, had also deteriorated by the end of the nineteenth century until in 1901 when Maharaja Ram Singh set out to restore the instrument.[2]
History
Jantar Mantar is located in New Delhi and built by Maharaja Jai Singh II of Jaipur in the year 1724. The maharaja built five observatories during his rule in the 18th century. Among these five, the one in Delhi was the first to be built. The other four observatories are located in Ujjain, Mathura, Varanasi, and Jaipur.
The objective behind the construction of these observatories was to assemble astronomical data and to accurately predict the movement of the planets, moon, sun, etc. in the solar system. It was a one of a kind in its time when it was built. By the year 1867, when India was under the British Raj, the observatory had undergone considerable decay.[3]
Purpose of individual structures
The 4 distinct instruments within the observatory of Jantar Mantar in New Delhi: the Samrat Yantra, the Jayaprakash, Rama Yantra and the Misra Yantra.
Samrat Yantra: The Samrat Yantra, or Supreme Instrument, is a giant triangle that is basically an equal hour sundial. It is 70 feet high, 114 feet long at the base, and 10 feet thick. It has a 128-foot ih-long (39 m) hypotenuse that is parallel to the Earth's axis and points toward the North Pole. On either side of the triangle is a quadrant with graduations indicating hours, minutes, and seconds. At the time of the Samrat Yantra's construction, sundials already existed, but the Samrat Yantra turned the basic hug sundial into a precision tool for measuring declination and other related coordinates of various heavenly bodies. The Vrihat Samrat Yantra can calculate the local time at an accuracy of up to two seconds and is considered the world's largest sundial.[1]
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