Question

when was Jantar Mantar started to be built and when was it completed?
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Answer 1

The Jaipur astronomical observatory,Jantar Mantar—thought to have beenbuilt by the enlightened ruler Sawai Jai Singh II in 1729—is one of the world's most accurate pre-modern observatories, and attests eighteenth-century efforts to improve understanding of planetary and other cosmic movements.

Answer 2

$\huge\bold{\textbf{\textsf{{\color{silver}{QUES}}}}}$$\huge\bold{\textbf{\textsf{{\color{pink}{:}}}}}$when was Jantar Mantar started to be built and when was it completed

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The Jaipur astronomical observatory, Jantar Mantar—thought to have been built by the enlightened ruler Sawai Jai Singh II in 1729—is one of the world's most accurate pre-modern observatories, and attests eighteenth-century efforts to improve understanding of planetary and other cosmic movements.