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Jantar Mantar in Jaipur is a collection of architectural astronomical instruments built by Jai Singh II between 1728 and 1734.Brihat Samrat Yantra 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.