जंतर-मंतर जयपुर। Jantar Mantar japur । jaipur

*The Jantar Mantar is a collection of 19 astronomical instruments built by *the Rajput king Sawai Jai Singh, the founder of Jaipur, Rajasthan.
*The monument was completed in 1734.
It features the world's largest stone sundial, and is a UNESCO World Heritage Site.
*It is near City Palace and Hawa Mahal.
*The instruments allow the observation of astronomical positions with the naked eye.
*The observatory is an example of the Ptolemaic positional astronomy which was shared by many civilizations.
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