This unique early 18 Century observatory was built by Sawai Jai Singh II of Jaipur. A keen astronomer, the Maharaja built five observatories to calculate planetary positions & eclipses. The instruments are “Samrat Yantra”, an instrument whose hypotenuse is perpendicular to the earth’s axis, “Jai Prakash Yantra”, which verifies the time of the summer equinox, the “Ram Yantra”, which reads the altitude of the sun, and the “Mishra Yantra”, used for a variety of astronomical observations. The observatory lies today in a pleasant park surrounded by high rises at the end of Parliament Street. Timings: 09:00 – 18:00 Hrs. Open on all days.