Samrat Yantra and Jai-Prakash Yantra, Jantar Mantar, Delhi, early 19th century, William Daniell

Samrat yantra and behind it the jai-prakash yantra, which consists of two concave hemispherical structures used to measure the sun's position of the sun and other celestial bodies. Date: early 18th century. Place of creation: Jantar Mantar, Delhi.