Jantar Mantar, a renowned observatory established in 1737 by the famous Maharaja of Jaipur Jai Singh. This Jantar Mandir at Varanasi is a replica of Jantar Mandir in New Delhi and other places.
This observatory was built to find out local time, planetary and star movements. This was used to predict the eclipses and also the declination of sun. This observatory is credited with many instruments to record the position, speed and motion of the stars. Indian Astronomical theories and calculations are practiced here.
The structure of the Jantar Mantar is captivating with complex architectural styles. It is a real attractive spot to astronomers, scholars, engineers, architects and scientists. Some of the valuable instruments (Yanthra) available here are Digansha Yantra, Krantivritta Yantra, Dhruva Yantra and Prakash Yantra.