The Jantar Mantar is a collection of nineteen architectural astronomical instruments built by the Kachwaha Rajput king Sawai Jai Singh II, the founder of Jaipur, Rajasthan. The monument was completed in 1734.[1][2] It features the world`s largest stone sundial, and is a UNESCO World Heritage site.[1][3] It is located near City Palace and Hawa Mahal.[4] The instruments allow the observation of astronomical positions with the naked eye.[1] The observatory is an example of the Ptolemaic positional astronomy which was shared by many civilizations.[

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