The Jantar Mantar of Delhi, a set of masonry astronomical instruments, was built by
- A.Sawai Jai Singh II
- B.Shah Jahan
- C.Muhammad Shah
- D.Raja Man Singh
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The ruler of Amber and founder of Jaipur built the Delhi Jantar Mantar in 1724, the first of the five observatories he raised, the others being at Jaipur, Ujjain, Mathura and Varanasi.
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