The Jantar Mantar at Delhi

My original information about the Jantar Mantar at Delhi said that it was "built under the reign of the Mughal ruler Muhammad Shah, who reigned from 1791 to 1841." That seems to be incorrect. I think that the observatory in Delhi was also built on the orders of Maharaja Sawai Jai Singh II, ruler of the state of Jaipur in Rajasthan from 1699 to 1743. I changed the text accordingly. If anyone has a reference to verify this I would appreciate a response to this comment.