Jantar Mantar
The scholarly Sawai Jai Singh II was well aware of European developments in the field of astronomy and wanted to create one of the world's finest observatories. He supervised the design and construction of five remarkable facilities in northern India, and Jantar Mantar is the largest and best preserved of the five. Built in 1726 out of masonry, marble, and brass, this observatory is neatly laid out and equipped with simple solar instruments called yantras, which look like large, abstract sculptures, and are remarkably precise in measuring complex celestial data like time, the location of stars, and angles of planets, and predicting forthcoming eclipses. Such accuracy was desired for creating astrological predictions. A guided tour is available for an additional ₹200, and guides will explain the history and how these devices work, as they're fascinating and, for nonscientists, somewhat complicated.
Avoid the observatory at noon, as it can be very hot.
