Jantar Mantar

Jantar Mantar is a historical astronomical observatory located in New Delhi, India. It consists of 13 architectural astronomy instruments, built by Maharaja Jai Singh II of Jaipur, from 1724 onwards. The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets. The site features several distinct instruments, including the Samrat Yantra, a giant triangle that is basically an equal hour sundial, the Ram Yantra, used to measure the altitude of stars, the Jayaprakash, which consists of hollowed out hemispheres with markings on their concave surfaces, and the Mishra yantras, which were able to indicate when it was noon in various cities all over the world. The observatory is a significant historical site and a popular tourist attraction, showcasing the astronomical knowledge and traditions of India