This observatory was built in 1734 for the study of space and time. The builder of the Jantar Mantar Maharaja Sawai Jai Singh was a brilliant star and great scholar of his subjects like astronomy and Indian politics. He is the ruler of Amber and founder of Jaipur, a great builder and ruler and exceptional astronomer. Sawai Jai Singh II was commissioned by Emperor Muhammad Shah, to make corrections in the astronomical tables and to confirm the data, already available on the planetary positions.