Jantar Mantar, Varanasi

The Jantar Mantar observatory (1737) is located above the ghats on the Ganges, much above the high water level in the Ganges next to the Manmandir Ghat, near to Dasaswamedh Ghat and adjoining the palace of Raja Jai Singh of Jaipur. Compared to the observatories at Jaipur and Delhi, it is less well equipped but has a unique equatorial sundial which is functional and allows measurements to be monitored and recorded by one person.