The Jantar Mantar in Jaipur is a collection of architectural astronomical instruments,built by Maharaja(king) Jai Singh 2 at his then new capital of Jaipur between 1727 and 1734.It is modelled after the that he had built at the Mughal capital of Delhi.He had constructed a total of five such facilities at different locations,including the one at Delhi and Jaipur.The Jaipur observatory is the largest and the best preserved of these and has a set of some 20 main fixed instruments built in masonry.It has been inscribed as cultural property on the UNESCO World Heritage in 2013 as "an expression of the astronomical skills and cosmological concepts of the court of a scholarly prince at the end of the Mughal period"The one at Delhi is also good.It consists of 13 architectural astronomy instruments.There is a plaque fixed on one of the structures in the Jantar Mantar obsevatory in New Delhi that was placed there in 1910 mistakenly dating the construction of the complex to the year 1710.Later research,though suggests 1724vas the actual year of construction.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 1867.The Ram yantra , The Samrat Yantra,Jayprakash Yantra and The mishras yantra are the distinct instruments of Jantar Mantar.
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