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Jantar Mantar in Jaipur is a collection of architectural astronomical instruments built by Jai Singh II between 1728 and 1734.The largest instrument is the Brihat Samrat Yantra it has a 75 foot high gnomon set at an angle of 27 degrees. It is the biggest sun dial in the world, accurate to about 2 seconds local time,it is still in use by astrologers to aid in the prediction of the monsoon rains, and subsequent success or failure of crops.