 The Jantar Mantar observatory , constructed in 1737 , is located above the ghats along the Ganges , and is adjacent to the Manmandir and Dasaswamedh Ghats and near the palace of Raja Jai Singh of Jaipur . While less equipped than the observatories at Jaipur and Delhi , the Jantar Mantar has a unique equatorial sundial which is functional and allows measurements to be monitored and recorded by one person . 
 The Jantar Mantar observatory , constructed in 1737 , is located above the ghats along the Ganges , and <a href='drop_aux' title='1'><mark>is</mark></a>adjacent to the Manmandir and Dasaswamedh Ghats and near the palace of Raja Jai Singh of Jaipur . While less equipped than the observatories at Jaipur and Delhi , the Jantar Mantar <a href='got' title='2'><mark>has</mark></a> a unique equatorial sundial which <a href='drop_aux' title='3'><mark>is</mark></a>functional and <a href='uninflect' title='4'><mark>allows</mark></a> measurements to be monitored and recorded by one person . 
The Jantar Mantar observatory , constructed in 1737 , is located above da ghats along tdaGanges , and adjacent to thdaanmandir and Dasaswamedh Ghats and near thedalace of Raja Jai Singh of Jaipur . While less equipped than the observatories at Jaipur and Delhi , the Jantar Mantar got a unique equatorial sundial which functional and allow measurements to be monitored and recorded by one person .