Introduction to Jantar Mantar: Jantar Mantar is the proud work of the genius Maharaja Jai Singh II. This enthusiastic astronomy enthusiast built the capital of the city-state. When moving from Anmer to Jaipur, the huge Jantar Mantar Observatory was built next to the City Palace to observe planetary movements and detect the order of the universe. Every instrument in the observatory is a unique marble building, with sundial, Theodolite and meridian are used to predict lunar eclipses, etc., and use sunlight and projection to calculate time and the positions of stars in the universe. In the past, local people would gather here on the full moon day before the rainy season every year to use these instruments to predict the rainfall and crop harvests of the year.